通过HttpURLConnection模拟post表单提交

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;
    }
}