java模拟表单请求【从网上一大神博客复制下来的，忘了是从哪了，放在这方便

public class FormFieldKeyValuePair {
	private static final long serialVersionUID = 1L;

	// The form field used for receivinguser's input,

	// such as "username" in "
 "

	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;

	}
}

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 "
 "

	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;

	}
}

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
 
   generalFormFields,  
            ArrayList
  
    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; // 传输内容 StringBuffer contentBody = new StringBuffer("--" + BOUNDARY); // 尾 String endBoundary = "\r\n--" + boundary + "--\r\n"; OutputStream out = connection.getOutputStream(); // 1. 处理文字形式的POST请求 for (FormFieldKeyValuePair ffkvp : generalFormFields) { contentBody.append("\r\n") .append("Content-Disposition: form-data; name=\"") .append(ffkvp.getKey() + "\"") .append("\r\n") .append("\r\n") .append(ffkvp.getValue()) .append("\r\n") .append("--") .append(boundary); } String boundaryMessage1 = contentBody.toString(); out.write(boundaryMessage1.getBytes("utf-8")); // 2. 处理文件上传 for (UploadFileItem ufi : filesToBeUploaded) { contentBody = new StringBuffer(); contentBody.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(); contentBody.append("------------HV2ymHFg03ehbqgZCaKO6jyH"); String boundaryMessage = contentBody.toString(); out.write(boundaryMessage.getBytes("utf-8")); // System.out.println(boundaryMessage); } out.write("------------HV2ymHFg03ehbqgZCaKO6jyH--\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"; } // System.out.print(strResponse); return strResponse; } }
  
 

import java.util.ArrayList;

public class Test {

	public static void main(String[] args) {
		 // 设定服务地址  
        String serverUrl = "http://localhost:8088/api/extension/upload_file";//上传地址  
          
        // 设定要上传的普通Form Field及其对应的value  
        ArrayList
 
   ffkvp = new ArrayList
  
   (); // 设定要上传的文件 ArrayList
   
     ufi = new ArrayList
    
     (); ufi.add(new UploadFileItem("file", "D:\\1.jpg")); HttpPostEmulator hpe = new HttpPostEmulator(); String response; try { response = hpe.sendHttpPostRequest(serverUrl, ffkvp, ufi); System.out.println("Responsefrom server is: " + response); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } }