[Java] 模拟HTTP的Get和Post请求

在之前，写了篇Java模拟HTTP的Get和Post请求的文章，这篇文章起源与和一个朋友砍飞信诈骗网站的问题，于是动用了Apache的comments-net包，也实现了get和post的http请求，并且将响应html代码获取。可是细心的博友提出：在获取有些网站出现乱码，最后发现没有处理字符集，这里做针对博友的意见做了增强，增强部分主要是响应内容的字符编码、相应代码的美化选项。

下面是代码：

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpMethod;
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.params.HttpMethodParams;
import org.apache.commons.httpclient.util.URIUtil;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

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

/**
* HTTP工具箱
*
* @author leizhimin 2009-6-19 16:36:18
*/
public final class HttpTookit {
private static Log log = LogFactory.getLog(HttpTookit.class);

/**
* 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();
HttpMethod method = new GetMethod(url);
try {
if (StringUtils.isNotBlank(queryString))
//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) {
log.error("执行HTTP Get请求时，编码查询字符串“" + queryString + "”发生异常！", e);
} catch (IOException e) {
log.error("执行HTTP Get请求" + url + "时，发生异常！", e);
} 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<String, String> params, String charset, boolean pretty) {
StringBuffer response = new StringBuffer();
HttpClient client = new HttpClient();
HttpMethod method = new PostMethod(url);
//设置Http Post数据
if (params != null) {
HttpMethodParams p = new HttpMethodParams();
for (Map.Entry<String, String> entry : params.entrySet()) {
p.setParameter(entry.getKey(), entry.getValue());
}
method.setParams(p);
}
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) {
log.error("执行HTTP Post请求" + url + "时，发生异常！", e);
} finally {
method.releaseConnection();
}
return response.toString();
}

public static void main(String[] args) {
String y = doGet("http://video.sina.com.cn/life/tips.html", null, "GBK", true);
System.out.println(y);
}
}

 

其实，这里的美化加入系统平台无关的换行符，可以任何平台上正确显示换行。

另外发现，通过JDK自带类库实现的请求，往往在请求一些url时，无法获取到请求结果。但此工具总能保证只要你的浏览器能打开，它总能忠实的将响应的内容反馈回来。

另外，将查看Java平台环境的代码给出来，很常用！

public static void main(String[] args)
{
Properties p = System.getProperties();
for (Map.Entry<Object, Object> entry : p.entrySet())
{
System.out.println(entry.getKey() + " = " + entry.getValue());
}
}

 

java.runtime.name = Java(TM) SE Runtime Environment
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line.separator =

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Process finished with exit code 0

 

再次感谢细心博友的宝贵意见，让此工具变得更完善，更好用！

本文出自 “熔 岩” 博客，转载请与作者联系！

 

转载自:http://lavasoft.blog.51cto.com/62575/175911/