应用程序模拟表单向Servlet传送属性和文件

原文参考地址 :http://blog.csdn.net/pathuang68/article/details/6920076

找了半天，找到上面的原文地址，然后试了试，发现word等生成了文件，但打不开。然后就发了一个.txt文件，发现文件最后多出了MIME的协议头。

发送文件的核心代码主要是HttpPostEmulator.java类，看了一下作者的写的格式，又参考了一下MIME的书写方式，改进了一下

HttpPostEmulator类:

import java.io.BufferedReader;import java.io.DataInputStream;import java.io.File;import java.io.FileInputStream;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStream;import java.net.HttpURLConnection;import java.net.URL;import java.util.ArrayList;public class HttpPostEmulator {//每个post参数之间的分隔。随意设定，只要不会和其他的字符串重复即可。    private static final String BOUNDARY ="----------HV2ymHFg03ehbqgZCaKO6jyH";    public String sendHttpPostRequest(String serverUrl    ,ArrayList<FormFieldKeyValuePair>generalFormFields,    ArrayList<UploadFileItem>filesToBeUploaded) throws Exception{              // 向服务器发送post请求              URL url = new URL(serverUrl/*"http://127.0.0.1:8080/test/upload"*/);              HttpURLConnection connection= (HttpURLConnection) url.openConnection();                         // 发送POST请求必须设置如下两行              connection.setDoOutput(true);              connection.setDoInput(true);              connection.setUseCaches(false);              connection.setRequestMethod("POST");              connection.setRequestProperty("Connection","Keep-Alive");              connection.setRequestProperty("Charset","UTF-8");              connection.setRequestProperty("Content-Type","multipart/form-data; boundary=" + BOUNDARY);                           // 头              String boundary = BOUNDARY;              boolean isParams = false;              // 传输内容              StringBuffer contentBody =new StringBuffer();              // 尾              String endBoundary ="\r\n--" + boundary + "--\r\n";                        OutputStream out =connection.getOutputStream();                        // 1. 处理普通表单域(即形如key = value对)的POST请求              for(FormFieldKeyValuePair ffkvp : generalFormFields){                 isParams = true;                       contentBody.append("--"+BOUNDARY).append("\r\n")                      .append("Content-Disposition: form-data; name=\"")                      .append(ffkvp.getKey() + "\"")                      .append("\r\n")                      .append("\r\n")                      .append(ffkvp.getValue())                      .append("\r\n");              }              //contentBody.append("\r\n");              String boundaryMessage1 =contentBody.toString();              if(isParams){                 out.write(boundaryMessage1.getBytes("utf-8"));              }              // 2. 处理文件上传              for(UploadFileItem ufi :filesToBeUploaded){                       contentBody = new StringBuffer();                       contentBody.append("--"+BOUNDARY).append("\r\n")                     .append("Content-Disposition:form-data; name=\"")                     .append(ufi.getFormFieldName() +"\"; ")   // form中field的名称                     .append("filename=\"")                     .append(ufi.getFileName() +"\"")   //上传文件的文件名，包括目录                     .append("\r\n")                     .append("Content-Type:application/octet-stream")                     .append("\r\n\r\n");                                             String boundaryMessage2 = contentBody.toString();                       out.write(boundaryMessage2.getBytes("utf-8"));                                            // 开始真正向服务器写文件                       File file = new File(ufi.getFileName());                       DataInputStream dis= new DataInputStream(new FileInputStream(file));                       int bytes = 0;                       byte[] bufferOut =new byte[(int) file.length()];                       bytes =dis.read(bufferOut);                       out.write(bufferOut,0, bytes);                       dis.close();                                              out.write("\r\n".getBytes("utf-8"));                       //                       contentBody.setLength(0);//                       contentBody.append("--"+BOUNDARY).append("\r\n");                     ////                       String boundaryMessage = contentBody.toString();//                       out.write(boundaryMessage.getBytes("utf-8"));//                       System.out.println(boundaryMessage);              }              //out.write(("--"+ BOUNDARY + "--\r\n").getBytes("UTF-8"));                          // 3. 写结尾              out.write(endBoundary.getBytes("utf-8"));              out.flush();              out.close();                          // 4. 从服务器获得回答的内容              String strLine="";              String strResponse ="";              InputStream in =connection.getInputStream();              BufferedReader reader = new BufferedReader(new InputStreamReader(in));              while((strLine =reader.readLine()) != null){                       strResponse +=strLine +"\n";              }              return strResponse;    }}

ClientPost类 

import java.util.ArrayList;import java.util.HashMap;import java.util.Iterator;public class ClientPost {    public static String sendForms(String servletURL,HashMap paramsMap,HashMap fileMap){        ArrayList<FormFieldKeyValuePair> ffkvp = new ArrayList<FormFieldKeyValuePair>();        if(paramsMap!=null){        Iterator iter = paramsMap.keySet().iterator();        while(iter.hasNext()){        String key = (String)iter.next();        String value = (String)paramsMap.get(key);        ffkvp.add(new FormFieldKeyValuePair(key, value));        }        }             // 设定要上传的文件。UploadFileItem见后面的代码        ArrayList<UploadFileItem> ufi = new ArrayList<UploadFileItem>();        if(fileMap!=null){        Iterator iter = fileMap.keySet().iterator();        while(iter.hasNext()){        String key = (String)iter.next();        String value = (String)fileMap.get(key);        //ufi.add(new UploadFileItem("upload1", "E:\\Asturias.mp3"));        ufi.add(new UploadFileItem(key, value));        }        }        String response = "";        try{        HttpPostEmulator hpe = new HttpPostEmulator();        response =hpe.sendHttpPostRequest(servletURL, ffkvp, ufi);        }catch(Exception ex){        System.out.println(ex.getMessage());            response = ex.getMessage();        }        return response;    }}

UploadFileItem类

import java.io.Serializable;public class UploadFileItem implements Serializable{private static final long serialVersionUID = 1L;    // The form field name in a form used foruploading a file,    // such as "upload1" in "<inputtype="file" name="upload1"/>"    private String formFieldName;    // File name to be uploaded, thefileName contains path,    // such as "E:\\some_file.jpg"    private String fileName;      public UploadFileItem(String formFieldName, String fileName){              this.formFieldName =formFieldName;              this.fileName = fileName;    }    public String getFormFieldName(){              return formFieldName;    }    public void setFormFieldName(String formFieldName){              this.formFieldName =formFieldName;    }    public String getFileName(){              return fileName;    }    public void setFileName(String fileName){              this.fileName = fileName;    }}

FormFieldKeyValuePair.java

import java.io.Serializable;public class FormFieldKeyValuePair implements Serializable{ private static final long serialVersionUID = 1L;     // The form field used for receivinguser's input,     // such as "username" in "<inputtype="text" name="username"/>"     private String key;     // The value entered by user in thecorresponding form field,     // such as "Patrick" the abovementioned formfield "username"     private String value;     public FormFieldKeyValuePair(String key, String value){               this.key = key;               this.value = value;     }     public String getKey(){               return key;     }     public void setKey(String key){               this.key = key;     }     public String getValue(){               return value;     }     public void setValue(String value){               this.value = value;     }}

ServerReceive类

import org.apache.commons.fileupload.FileItem;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;public class ServerReceive  extends HttpServlet{private static final long serialVersionUID = 1L;     @Override    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException{         super.doGet(req, resp);    }    @SuppressWarnings({"unchecked", "deprecation" })    @Override    protected void doPost(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException{               DiskFileItemFactory factory =new DiskFileItemFactory();        //得到绝对文件夹路径，比如"D:\\Tomcat6\\webapps\\test\\upload"        String path = req.getRealPath("/upload");        //临时文件夹路径        String repositoryPath =req.getRealPath("/upload/temp");                // 设定临时文件夹为repositoryPath        factory.setRepository(new File(repositoryPath));         // 设定上传文件的阈值，如果上传文件大于1M，就可能在repository        // 所代 表的文件夹中产生临时文件，否则直接在内存中进行处理        factory.setSizeThreshold(1024* 1024);                  //System.out.println("----"+ req.getContextPath());  // 得到相对文件夹路径，比如 "/test"                   // 创建一个ServletFileUpload对象        ServletFileUpload uploader =new ServletFileUpload(factory);        try{            // 调用uploader中的parseRequest方法，可以获得请求中的相关内容，            // 即一个FileItem类型的ArrayList。FileItem是在            // org.apache.commons.fileupload中定义的，它可以代表一个文件，            // 也可以代表一个普通的form field            ArrayList<FileItem>list = (ArrayList<FileItem>)uploader.parseRequest(req);            System.out.println(list.size());            for(FileItem fileItem : list){                 if(fileItem.isFormField()){      // 如果是普通的form field                         String name = fileItem.getFieldName();                         String value = fileItem.getString();                         System.out.println(name+ " = " + value);                  } else {  // 如果是文件                         String value = fileItem.getName();                         int start = value.lastIndexOf("\\");                         String fileName = value.substring(start + 1);                         // 将其中包含的内容写到path(即upload目录)下，                          // 名为fileName的文件中                         fileItem.write(new File(path, fileName));                  }             }             }catch(Exception e) {                       e.printStackTrace();             }             // 向客户端反馈结果             PrintWriter out =resp.getWriter();             out.print("OK");             out.flush();             out.close();                         super.doPost(req, resp);    }}

调用入口

private String uploadFiles(HttpServletRequest request){    try{    HashMap fileMap = new HashMap();    String filePath = this.getClass().getClassLoader().getResource("/").toURI().getPath();String webRoot=filePath.substring(0,filePath.indexOf("WEB-INF"));filePath=webRoot+ "WEB-INF";    fileMap.put("file1", filePath + "\\test.docx");    fileMap.put("file2", filePath + "\\test.txt");        HashMap paramMap = new HashMap();    paramMap.put("userid", "111111");     paramMap.put("username", "danielinbiti");             String rtn = ClientPost.sendForms("http://localhost:8080/test/ServerReceive", paramMap, fileMap);    return rtn;    }catch(Exception ex){    System.out.println(ex.getMessage());    }    return null;    }

经过测试，多个属性和多种文件都可以支持了。