springmvc的照片上传功能

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实现原理：利用ajaxfileupload.js + springmvc进行图片文件的上传，再利用base64编码技术得到图片的编码字符串，并返回到页面进行img预览。还可以吧编码字符串存入数据库，较大文件不建议存入数据库。(需要jQuery支持)

js代码：

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/**
* 图片上传
*/
function ajaxFileUpload() {
.ajaxFileUpload({  </li><li class="">       url:'../../../hr/upload.do', //需要链接到服务器地址  </li><li class="alt">       secureuri:false,  </li><li class="">       fileElementId:'file', //文件选择框的id属性  </li><li class="alt">       dataType: 'json',  //服务器返回的格式类型  </li><li class="">       success: function (data, status) //成功  </li><li class="alt">       {        </li><li class="">           var json =  eval("("+data+")");//解析返回的json  </li><li class="alt">           var imageCode = json.imageCode;  </li><li class="">           if(imageCode!='-1'){  </li><li class="alt">             ("#showImg").attr("src", imageCode);   </li><li class="">             $(”#input_photo”).val(imageCode);
}else{
alert(”上传失败！只允许上传图片类型(jpg,gif,png)且小于1M的照片”);
}
},
error: function (data, status, e) //异常
{
alert(”出错了，请重新上传！”);
}
});
}

/** * 图片上传 */function ajaxFileUpload() {    $.ajaxFileUpload({       url:'../../../hr/upload.do', //需要链接到服务器地址       secureuri:false,       fileElementId:'file', //文件选择框的id属性       dataType: 'json',  //服务器返回的格式类型       success: function (data, status) //成功       {                 var json =  eval("("+data+")");//解析返回的json           var imageCode = json.imageCode;           if(imageCode!='-1'){             $("#showImg").attr("src", imageCode);              $("#input_photo").val(imageCode);           }else{             alert("上传失败！只允许上传图片类型(jpg,gif,png)且小于1M的照片");           }       },       error: function (data, status, e) //异常       {          alert("出错了，请重新上传！");       }   });}

Java代码：

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import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.commons.CommonsMultipartFile;
import com.cpeam.hr.util.ImageUtil;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
/**
* 图片上传控制器
* @author tanfei
* @date 2013-09-23
*/
@Controller
@RequestMapping(“/hr”)
public class ImgUploadAction {
@RequestMapping(value=“uploadImg”)
public void uploadImg() {
}
/**
* 上传
* @param file
* @param request
* @param model
* @return
*/
@RequestMapping(value=“/upload”,method=RequestMethod.POST)
public void fileUpload(@RequestParam(“file”)CommonsMultipartFile file,HttpServletRequest request
,HttpServletResponse response){ //图片文件上传
Map<String, Object> resMap = new HashMap<String, Object>();
String imageCode = ”-1”;//默认上传失败
/**判断文件是否为空,空直接返回上传错误**/
if(!file.isEmpty()){
//获得文件后缀名
String suffix = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf(”.”));
if(suffix.equals(“.jpg”) || suffix.equals(“.gif”) || suffix.equals(“.png”)) {//检测图片类型
if(file.getSize() > 1000000) {
imageCode = ”-1”;
//throw new Exception(“上传失败：文件大小不能超过1M”);
}else {
try {
//将上传的图片转换成base64编码字符串
imageCode = ”data:image/gif;base64,” + ImageUtil.encodeImageToStr(file.getInputStream());
} catch (IOException e) {
e.printStackTrace();
}
}
}
}else{
imageCode = ”-1”;
}
resMap.put(”imageCode”, imageCode);
response.setContentType(”text/html;charset=UTF-8”);//指定响应内容类型，避免<pre…
try {
PrintWriter out = response.getWriter();
Gson gson = new GsonBuilder().create();
String gsonStr = gson.toJson(resMap);
out.write(gsonStr);
out.flush();
} catch (IOException e) {
e.printStackTrace();
}
}
}

import java.io.IOException;import java.io.PrintWriter;import java.util.HashMap;import java.util.Map;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.multipart.commons.CommonsMultipartFile;import com.cpeam.hr.util.ImageUtil;import com.google.gson.Gson;import com.google.gson.GsonBuilder;/** * 图片上传控制器 * @author tanfei * @date 2013-09-23 */@Controller@RequestMapping("/hr")public class ImgUploadAction {    @RequestMapping(value="uploadImg")    public void uploadImg() {    }    /**     * 上传     * @param file     * @param request     * @param model     * @return     */    @RequestMapping(value="/upload",method=RequestMethod.POST)    public void fileUpload(@RequestParam("file")CommonsMultipartFile file,HttpServletRequest request            ,HttpServletResponse response){  //图片文件上传        Map<String, Object> resMap = new HashMap<String, Object>();        String imageCode = "-1";//默认上传失败        /**判断文件是否为空,空直接返回上传错误**/        if(!file.isEmpty()){            //获得文件后缀名            String suffix = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf("."));            if(suffix.equals(".jpg") || suffix.equals(".gif") || suffix.equals(".png")) {//检测图片类型                if(file.getSize() > 1000000) {                    imageCode = "-1";                    //throw new Exception("上传失败：文件大小不能超过1M");                }else {                    try {                        //将上传的图片转换成base64编码字符串                        imageCode = "data:image/gif;base64," + ImageUtil.encodeImageToStr(file.getInputStream());                    } catch (IOException e) {                        e.printStackTrace();                    }                }            }        }else{            imageCode = "-1";        }        resMap.put("imageCode", imageCode);        response.setContentType("text/html;charset=UTF-8");//指定响应内容类型，避免<pre...        try {            PrintWriter out = response.getWriter();            Gson gson = new GsonBuilder().create();            String gsonStr = gson.toJson(resMap);            out.write(gsonStr);            out.flush();        } catch (IOException e) {            e.printStackTrace();        }    }}

springmvc文件配置：

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<!– 文件上传相关start tanfei 2013-09-20–>
<!– SpringMVC上传文件时，需要配置MultipartResolver处理器 –>
<bean id=“multipartResolver” class=“org.springframework.web.multipart.commons.CommonsMultipartResolver”>
<!– 指定所上传文件的总大小不能超过200KB。注意maxUploadSize属性的限制不是针对单个文件，而是所有文件的容量之和 –>
<property name=“maxUploadSize” value=“200000”/>
</bean>
<!– SpringMVC在超出上传文件限制时，会抛出org.springframework.web.multipart.MaxUploadSizeExceededException –>
<!– 该异常是SpringMVC在检查上传的文件信息时抛出来的，而且此时还没有进入到Controller方法中 –>
<bean id=“exceptionResolver” class=“org.springframework.web.servlet.handler.SimpleMappingExceptionResolver”>
<property name=“exceptionMappings”>
<props>
<!– 遇到MaxUploadSizeExceededException异常时，自动跳转到/WEB-INF/jsp/error_fileupload.jsp页面 –>
<prop key=“org.springframework.web.multipart.MaxUploadSizeExceededException”>error_fileupload</prop>
<prop key=“java.lang.Exception”>error_all</prop>
</props>
</property>
</bean>
<!– 文件上传相关end –>

<!-- 文件上传相关start tanfei 2013-09-20-->    <!-- SpringMVC上传文件时，需要配置MultipartResolver处理器  -->    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">         <!-- 指定所上传文件的总大小不能超过200KB。注意maxUploadSize属性的限制不是针对单个文件，而是所有文件的容量之和 -->        <property name="maxUploadSize" value="200000"/>     </bean>     <!-- SpringMVC在超出上传文件限制时，会抛出org.springframework.web.multipart.MaxUploadSizeExceededException -->        <!-- 该异常是SpringMVC在检查上传的文件信息时抛出来的，而且此时还没有进入到Controller方法中 -->    <bean id="exceptionResolver" class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">         <property name="exceptionMappings">             <props>                 <!-- 遇到MaxUploadSizeExceededException异常时，自动跳转到/WEB-INF/jsp/error_fileupload.jsp页面 -->                <prop key="org.springframework.web.multipart.MaxUploadSizeExceededException">error_fileupload</prop>                 <prop key="java.lang.Exception">error_all</prop>            </props>         </property>     </bean>     <!-- 文件上传相关end -->

jquery插件ajaxfileupload.js:

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jQuery.extend({
createUploadIframe: function(id, uri)
{
//create frame
var frameId = ‘jUploadFrame’ + id;
var iframeHtml = ‘<iframe id=”’ + frameId + ‘” name=”’ + frameId + ‘” style=”position:absolute; top:-9999px; left:-9999px”’;
if(window.ActiveXObject)
{
if(typeof uri== ‘boolean’){
iframeHtml += ’ src=”’ + ‘javascript:false’ + ‘”’;
}
else if(typeof uri== ‘string’){
iframeHtml += ’ src=”’ + uri + ‘”’;
}
}
iframeHtml += ’ />’;
jQuery(iframeHtml).appendTo(document.body);
return jQuery(‘#’ + frameId).get(0);
},
createUploadForm: function(id, fileElementId,data)
{
//create form
var formId = ‘jUploadForm’ + id;
var fileId = ‘jUploadFile’ + id;
var form = jQuery(‘<form action=”“ method=”POST” name=”’ + formId + ‘” id=”’ + formId + ‘” enctype=”multipart/form-data”></form>’);
var oldElement = jQuery(‘#’ + fileElementId);
var newElement = jQuery(oldElement).clone();
jQuery(oldElement).attr(’id’, fileId);
jQuery(oldElement).before(newElement);
jQuery(oldElement).appendTo(form);
/***** 增加参数的支持 *****/
if (data) {
for (var i in data) {
$(’<input type=”hidden” name=”’ + i + ‘” value=”’ + data[i] + ‘” />’).appendTo(form);
}
}
//set attributes
jQuery(form).css(’position’, ‘absolute’);
jQuery(form).css(’top’, ‘-1200px’);
jQuery(form).css(’left’, ‘-1200px’);
jQuery(form).appendTo(’body’);
return form;
},
ajaxFileUpload: function(s) {
// TODO introduce global settings, allowing the client to modify them for all requests, not only timeout
s = jQuery.extend({}, jQuery.ajaxSettings, s);
var id = new Date().getTime();
// ADD s.data
var form = jQuery.createUploadForm(id, s.fileElementId, s.data);
var io = jQuery.createUploadIframe(id, s.secureuri);
var frameId = ‘jUploadFrame’ + id;
var formId = ‘jUploadForm’ + id;
// Watch for a new set of requests
if ( s.global && ! jQuery.active++ )
{
jQuery.event.trigger( ”ajaxStart” );
}
var requestDone = false;
// Create the request object
var xml = {}
if ( s.global )
jQuery.event.trigger(”ajaxSend”, [xml, s]);
// Wait for a response to come back
var uploadCallback = function(isTimeout)
{
var io = document.getElementById(frameId);
try
{
if(io.contentWindow)
{
xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;
xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
}else if(io.contentDocument)
{
xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null;
xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;
}
}catch(e)
{
jQuery.handleError(s, xml, null, e);
}
if ( xml || isTimeout == “timeout”)
{
requestDone = true;
var status;
try {
status = isTimeout != ”timeout” ? “success” : “error”;
// Make sure that the request was successful or notmodified
if ( status != “error” )
{
// process the data (runs the xml through httpData regardless of callback)
var data = jQuery.uploadHttpData( xml, s.dataType );
// If a local callback was specified, fire it and pass it the data
if ( s.success )
s.success( data, status );
// Fire the global callback
if( s.global )
jQuery.event.trigger( ”ajaxSuccess”, [xml, s] );
} else
jQuery.handleError(s, xml, status);
} catch(e)
{
status = ”error”;
jQuery.handleError(s, xml, status, e);
}
// The request was completed
if( s.global )
jQuery.event.trigger( ”ajaxComplete”, [xml, s] );
// Handle the global AJAX counter
if ( s.global && ! –jQuery.active )
jQuery.event.trigger( ”ajaxStop” );
// Process result
if ( s.complete )
s.complete(xml, status);
jQuery(io).unbind()
setTimeout(function()
{ try
{
jQuery(io).remove();
jQuery(form).remove();
} catch(e)
{
jQuery.handleError(s, xml, null, e);
}
}, 100)
xml = null
}
}
// Timeout checker
if ( s.timeout > 0 )
{
setTimeout(function(){
// Check to see if the request is still happening
if( !requestDone ) uploadCallback( “timeout” );
}, s.timeout);
}
try
{
var form = jQuery(‘#’ + formId);
jQuery(form).attr(’action’, s.url);
jQuery(form).attr(’method’, ‘POST’);
jQuery(form).attr(’target’, frameId);
if(form.encoding)
{
jQuery(form).attr(’encoding’, ‘multipart/form-data’);
}
else
{
jQuery(form).attr(’enctype’, ‘multipart/form-data’);
}
jQuery(form).submit();
} catch(e)
{
jQuery.handleError(s, xml, null, e);
}
jQuery(’#’ + frameId).load(uploadCallback );
return {abort: function () {}};
},
/** handleError 方法在jquery1.4.2之后移除了，此处重写改方法 **/
handleError: function( s, xhr, status, e ) {
// If a local callback was specified, fire it
if ( s.error ) {
s.error.call( s.context || s, xhr, status, e );
}
// Fire the global callback
if ( s.global ) {
(s.context ? jQuery(s.context) : jQuery.event).trigger( ”ajaxError”, [xhr, s, e] );
}
},
uploadHttpData: function( r, type ) {
//alert(“–>” + r.responseText);
try{
//debugger;
var data = !type;
data = type == ”xml” || data ? r.responseXML : r.responseText;
// If the type is “script”, eval it in global context
if ( type == “script” ){
jQuery.globalEval( data );
}
// Get the JavaScript object, if JSON is used.
if ( type == “json” ){
/*** 如果返回的是字符串(JSON格式字符串)，下面会报错，导致无法走入sucess方法加上\” ***/
// eval( “data = ” + data );
eval(”data = \” ”+data+“ \” ”);
}
// evaluate scripts within html
if ( type == “html” ){
jQuery(”<div>”).html(data).evalScripts();
}
}catch(e) {
}
return data;
}
})

jQuery.extend({    createUploadIframe: function(id, uri)    {            //create frame            var frameId = 'jUploadFrame' + id;            var iframeHtml = '<iframe id="' + frameId + '" name="' + frameId + '" style="position:absolute; top:-9999px; left:-9999px"';            if(window.ActiveXObject)            {                if(typeof uri== 'boolean'){                    iframeHtml += ' src="' + 'javascript:false' + '"';                }                else if(typeof uri== 'string'){                    iframeHtml += ' src="' + uri + '"';                }               }            iframeHtml += ' />';            jQuery(iframeHtml).appendTo(document.body);            return jQuery('#' + frameId).get(0);                },    createUploadForm: function(id, fileElementId,data)    {        //create form           var formId = 'jUploadForm' + id;        var fileId = 'jUploadFile' + id;        var form = jQuery('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');            var oldElement = jQuery('#' + fileElementId);        var newElement = jQuery(oldElement).clone();        jQuery(oldElement).attr('id', fileId);        jQuery(oldElement).before(newElement);        jQuery(oldElement).appendTo(form);        /*****    增加参数的支持   *****/         if (data) {              for (var i in data) {                  $('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form);              }          }        //set attributes        jQuery(form).css('position', 'absolute');        jQuery(form).css('top', '-1200px');        jQuery(form).css('left', '-1200px');        jQuery(form).appendTo('body');              return form;    },    ajaxFileUpload: function(s) {        // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout                s = jQuery.extend({}, jQuery.ajaxSettings, s);        var id = new Date().getTime();        // ADD  s.data        var form = jQuery.createUploadForm(id, s.fileElementId, s.data);        var io = jQuery.createUploadIframe(id, s.secureuri);        var frameId = 'jUploadFrame' + id;        var formId = 'jUploadForm' + id;                // Watch for a new set of requests        if ( s.global && ! jQuery.active++ )        {            jQuery.event.trigger( "ajaxStart" );        }                    var requestDone = false;        // Create the request object        var xml = {}           if ( s.global )            jQuery.event.trigger("ajaxSend", [xml, s]);        // Wait for a response to come back        var uploadCallback = function(isTimeout)        {                       var io = document.getElementById(frameId);            try             {                               if(io.contentWindow)                {                     xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;                     xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;                }else if(io.contentDocument)                {                     xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null;                    xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;                }                                   }catch(e)            {                jQuery.handleError(s, xml, null, e);            }            if ( xml || isTimeout == "timeout")             {                               requestDone = true;                var status;                try {                    status = isTimeout != "timeout" ? "success" : "error";                    // Make sure that the request was successful or notmodified                    if ( status != "error" )                    {                        // process the data (runs the xml through httpData regardless of callback)                        var data = jQuery.uploadHttpData( xml, s.dataType );                        // If a local callback was specified, fire it and pass it the data                        if ( s.success )                            s.success( data, status );                        // Fire the global callback                        if( s.global )                            jQuery.event.trigger( "ajaxSuccess", [xml, s] );                    } else                        jQuery.handleError(s, xml, status);                } catch(e)                 {                    status = "error";                    jQuery.handleError(s, xml, status, e);                }                // The request was completed                if( s.global )                    jQuery.event.trigger( "ajaxComplete", [xml, s] );                // Handle the global AJAX counter                if ( s.global && ! --jQuery.active )                    jQuery.event.trigger( "ajaxStop" );                // Process result                if ( s.complete )                    s.complete(xml, status);                jQuery(io).unbind()                setTimeout(function()                                    {   try                                         {                                            jQuery(io).remove();                                            jQuery(form).remove();                                          } catch(e)                                         {                                            jQuery.handleError(s, xml, null, e);                                        }                                                                       }, 100)                xml = null            }        }        // Timeout checker        if ( s.timeout > 0 )         {            setTimeout(function(){                // Check to see if the request is still happening                if( !requestDone ) uploadCallback( "timeout" );            }, s.timeout);        }        try         {            var form = jQuery('#' + formId);            jQuery(form).attr('action', s.url);            jQuery(form).attr('method', 'POST');            jQuery(form).attr('target', frameId);            if(form.encoding)            {                jQuery(form).attr('encoding', 'multipart/form-data');                           }            else            {                   jQuery(form).attr('enctype', 'multipart/form-data');                        }                       jQuery(form).submit();        } catch(e)         {                       jQuery.handleError(s, xml, null, e);        }        jQuery('#' + frameId).load(uploadCallback   );        return {abort: function () {}};     },    /** handleError 方法在jquery1.4.2之后移除了，此处重写改方法 **/    handleError: function( s, xhr, status, e ) {        // If a local callback was specified, fire it        if ( s.error ) {            s.error.call( s.context || s, xhr, status, e );        }        // Fire the global callback        if ( s.global ) {            (s.context ? jQuery(s.context) : jQuery.event).trigger( "ajaxError", [xhr, s, e] );        }    },    uploadHttpData: function( r, type ) {        //alert("-->" + r.responseText);        try{            //debugger;            var data = !type;            data = type == "xml" || data ? r.responseXML : r.responseText;            // If the type is "script", eval it in global context            if ( type == "script" ){                 jQuery.globalEval( data );            }            // Get the JavaScript object, if JSON is used.            if ( type == "json" ){                 /*** 如果返回的是字符串(JSON格式字符串)，下面会报错，导致无法走入sucess方法 加上\"  ***/                 // eval( "data = " + data );                 eval("data = \" "+data+" \" ");            }            // evaluate scripts within html            if ( type == "html" ){                jQuery("<div>").html(data).evalScripts();            }        }catch(e) {        }            return data;    }})

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