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Java 使用HttpClient模拟 Http Get和Post 提交

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package com.html580.connection;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.URIException;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.util.URIUtil;
import org.junit.Test;

/**
* Description: httpclient模拟http请求,解决返回内容乱码问题
*/
public class HttpClientHelper {
/**
* 执行一个HTTP GET请求,返回请求响应的HTML
*
* @param url
* 请求的URL地址
* @param queryString
* 请求的查询参数,可以为null
* @param charset
* 字符集
* @param pretty
* 是否美化
* @return 返回请求响应的HTML
*/
public static String doGet(String url, String queryString, String charset,
boolean pretty) {
StringBuffer response = new StringBuffer();
HttpClient client = new HttpClient();
GetMethod method = new GetMethod(url);
try {
if (queryString != null && !queryString.equals(""))
// 对get请求参数做了http请求默认编码,好像没有任何问题,汉字编码后,就成为%式样的字符串
method.setQueryString(URIUtil.encodeQuery(queryString));
client.executeMethod(method);
if (method.getStatusCode() == HttpStatus.SC_OK) {
BufferedReader reader = new BufferedReader(
new InputStreamReader(method.getResponseBodyAsStream(),
charset));
String line;
while ((line = reader.readLine()) != null) {
if (pretty)
response.append(line).append(
System.getProperty("line.separator"));
else
response.append(line);
}
reader.close();
}
} catch (URIException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
method.releaseConnection();
}
return response.toString();
}

/**
* 执行一个HTTP POST请求,返回请求响应的HTML
*
* @param url
* 请求的URL地址
* @param params
* 请求的查询参数,可以为null
* @param charset
* 字符集
* @param pretty
* 是否美化
* @return 返回请求响应的HTML
*/
public static String doPost(String url, Map params,
String charset, boolean pretty) {
StringBuffer response = new StringBuffer();
HttpClient client = new HttpClient();
PostMethod method = new PostMethod(url);
// 设置Http Post数据
if (params != null) {
for (Map.Entry entry : params.entrySet()) {
method.addParameter(entry.getKey(), entry.getValue());
}
}
try {
client.executeMethod(method);
if (method.getStatusCode() == HttpStatus.SC_OK) {
BufferedReader reader = new BufferedReader(
new InputStreamReader(method.getResponseBodyAsStream(),
charset));
String line;
while ((line = reader.readLine()) != null) {
if (pretty)
response.append(line).append(
System.getProperty("line.separator"));
else
response.append(line);
}
reader.close();
}
} catch (IOException e) {
e.printStackTrace();
} finally {
method.releaseConnection();
}
return response.toString();
}


public void testSendGet() {
String url = "http://localhost:8080/jeeweb/testServlet";
String params = "username=admin&password=123456";
String str = doGet(url, params,"GBK", true);
System.out.println(str);
}

@Test
public void testSendPost() {
String url = "http://localhost:8080/jeeweb/testServlet";
Map params = new HashMap();
params.put("username", "admin");
params.put("password", "123456");
String str = doPost(url, params,"GBK", true);
System.out.println(str);
}

}
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