struts2上传图片后并显示图片

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利用struts自带的上传文件拦截器上传图片。

1.jsp页面

<body><s:form action="upload" method="post" theme="simple" enctype="multipart/form-data"><c:if test="${empty imageName }"><img alt="预览图片" src="<%=basePath%>${imageName}" id="images" name="images" style="display: none;"></c:if><c:if test="${not empty imageName }"><img alt="预览图片" src="<%=basePath%>${imageName}" id="images" name="images"></c:if><s:file name="file" id="fileImages"></s:file><!-- <div id="showpic1" onclick="document.getElementById('fileImages').click();" data="点击添加图片">选择文件</div> --><s:submit value="保存"></s:submit></s:form>  </body>

2.struts.xml配置文件

<action name="upload" class="com.itany.action.UploadAction" method="upload"><result name="success">/upload.jsp</result><result name="input">/upload.jsp</result><!-- 定义图片上传拦截器 --><interceptor-ref name="fileUpload"><!-- 定义图片大小 --><param name="maximumSize">500000</param> <param name="allowedTypes"> image/jpg,image/jpeg,image/bmp,image/gif,image/png </param></interceptor-ref> <!-- 自定义了拦截器后必手动定义默认的拦截器，否则默认的拦截器不会被执行 --><interceptor-ref name="defaultStack"></interceptor-ref></action>

3.Java后台代码

import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import javax.imageio.ImageIO;import javax.servlet.ServletContext;import javax.servlet.http.HttpSession;import org.apache.commons.io.FileUtils;import org.apache.commons.io.FilenameUtils;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class UploadAction extends ActionSupport{        private File file;    private String fileFileName;    private String fileContentType;    private String uploadUrl="uploadImage";        /**     *      * 上传图片     *      * @return     * @see [类、类#方法、类#成员]     */    public String upload()    {        ServletContext sc = ServletActionContext.getServletContext();        String realPath = sc.getRealPath(uploadUrl);                 String fileExt=getFileExt();          String fileName=getFileName("18251823253");               String fileAllName=fileName+"."+fileExt;                String path="";               if (fileContentType.indexOf("image") >= 0)        {            if (file != null)            {                File saveFile = new File(new File(realPath), fileAllName);                try                {                    FileUtils.copyFile(file, saveFile);                                        File dirFile = new File(new File("/" + uploadUrl), fileAllName);                    FileUtils.copyFile(file, dirFile);                    path = realPath + "/" + fileName + "." + fileExt;                }                catch (IOException e)                {                    e.printStackTrace();                }            }        }                HttpSession session = ServletActionContext.getRequest().getSession(false);        session.removeAttribute("imageName");        session.setAttribute("imageName", "/"+uploadUrl+"/"+fileAllName);        return "success";    }    /**     *      * 得到文件的后缀     * <功能详细描述>     * @return     * @see [类、类#方法、类#成员]     */    private String getFileExt()    {        return FilenameUtils.getExtension(fileFileName);    }        private String getFileName(String username)    {        fileFileName=username;        return fileFileName;    }        public File getFile()    {        return file;    }    public void setFile(File file)    {        this.file = file;    }    public String getFileFileName()    {        return fileFileName;    }    public void setFileFileName(String fileFileName)    {        this.fileFileName = fileFileName;    }    public String getFileContentType()    {        return fileContentType;    }    public void setFileContentType(String fileContentType)    {        this.fileContentType = fileContentType;    }    public String getUploadUrl()    {        return uploadUrl;    }    public void setUploadUrl(String uploadUrl)    {        this.uploadUrl = uploadUrl;    }    }

在webroot根目录下建个文件夹uploadImage

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