通过HttpURLConnection模拟post表单提交详解编程语言

package junit; 
 
import java.io.InputStream; 
import java.net.HttpURLConnection; 
import java.net.URL; 
 
import org.junit.Test; 
 
import com.hrtx.util.StreamTool; 
 
public class EsmTest { 
 
    /** 
     * 通过HttpURLConnection模拟post表单提交 
     * @throws Exception 
     */ 
    @Test 
    public void sendEms() throws Exception { 
        String wen = "MS2201828"; 
        String btnSearch = "EMS快递查询"; 
        URL url = new URL("http://www.kd185.com/ems.php"); 
        HttpURLConnection conn = (HttpURLConnection) url.openConnection(); 
        conn.setRequestMethod("POST");// 提交模式 
        // conn.setConnectTimeout(10000);//连接超时 单位毫秒 
        // conn.setReadTimeout(2000);//读取超时 单位毫秒 
        conn.setDoOutput(true);// 是否输入参数 
 
        StringBuffer params = new StringBuffer(); 
        // 表单参数与get形式一样 
        params.append("wen").append("=").append(wen).append("&") 
              .append("btnSearch").append("=").append(btnSearch); 
        byte[] bypes = params.toString().getBytes(); 
        conn.getOutputStream().write(bypes);// 输入参数 
        InputStream inStream=conn.getInputStream(); 
        System.out.println(new String(StreamTool.readInputStream(inStream), "gbk")); 
 
    } 
 
}

封装后的代码：


　　　/** 
     * 通过HttpURLConnection模拟post表单提交 
     *  
     * @param path 
     * @param params 例如"name=zhangsan&age=21" 
     * @return 
     * @throws Exception 
     */ 
    public static byte[] sendPostRequestByForm(String path, String params) throws Exception{ 
        URL url = new URL(path); 
        HttpURLConnection conn = (HttpURLConnection) url.openConnection(); 
        conn.setRequestMethod("POST");// 提交模式 
        // conn.setConnectTimeout(10000);//连接超时 单位毫秒 
        // conn.setReadTimeout(2000);//读取超时 单位毫秒 
        conn.setDoOutput(true);// 是否输入参数 
        byte[] bypes = params.toString().getBytes(); 
        conn.getOutputStream().write(bypes);// 输入参数 
        InputStream inStream=conn.getInputStream(); 
        return StreamTool.readInputStream(inStream); 
    }

package com.hrtx.util; 
 
import java.io.ByteArrayOutputStream; 
import java.io.InputStream; 
 
public class StreamTool { 
    /** 
     * 从输入流中读取数据 
     * @param inStream 
     * @return 
     * @throws Exception 
     */ 
    public static byte[] readInputStream(InputStream inStream) throws Exception{ 
        ByteArrayOutputStream outStream = new ByteArrayOutputStream(); 
        byte[] buffer = new byte[1024]; 
        int len = 0; 
        while( (len = inStream.read(buffer)) !=-1 ){ 
            outStream.write(buffer, 0, len); 
        } 
        byte[] data = outStream.toByteArray();//网页的二进制数据 
        outStream.close(); 
        inStream.close(); 
        return data; 
    } 
}