统一的URL编码

package demo0808.demo2; 
/** 
 * 由于网络上HTTP的POST请求需要进行编码 
 * 以此来适应不同的操作系统 
 * 编码成统一的ASCII字符 
 * 本类对Query语句进行URL编码 
 * 键值对中间用=连接 
 * 不同的键值对用&连接 
 */ 
import java.net.URLEncoder; 
 
public class QueryString { 
private StringBuilder query=new StringBuilder(); 
private String charset="UTF-8"; 
	/** 
	 * 无参默认构造函数 
	 */ 
	public QueryString() { 
	} 
	/** 
	 *  同步添加键值对 
	 * @param name 参数名称 
	 * @param value 参数值 
	 */ 
	public synchronized void add(String name,String value) { 
		query.append('&'); 
		encode(name,value); 
	} 
	/** 
	 * 同步进行URL编码 
	 * @param name 参数名称 
	 * @param value 参数值 
	 */ 
	private synchronized void encode(String name,String value) { 
		try { 
			query.append(URLEncoder.encode(name, charset)); 
			query.append('='); 
			query.append(URLEncoder.encode(value,charset)); 
		} catch (Exception ex) { 
			System.err.println("Bad VM can't support "+charset); 
		} 
	} 
	/** 
	 * 同步获取查询字符串 
	 * @return 字符串 
	 */ 
	public synchronized String getQuery() { 
		return query.toString(); 
	} 
	/** 
	 * 覆盖toString()方法 
	 */ 
	public String toString() { 
		return getQuery(); 
	} 
}

基于Http的post请求键值对填写

package demo0808.demo2; 
/** 
 * 针对HTTP协议的POST请求 
 * 表单自动填写 
 * 不考虑验证码识别 
 * 不考虑https类型的协议 
 */ 
import java.io.InputStream; 
import java.io.OutputStream; 
import java.io.OutputStreamWriter; 
import java.net.URL; 
import java.net.URLConnection; 
 
public class FormPoster { 
	private URL url; 
	private QueryString queryString=new QueryString() ; 
	/** 
	 * 构造函数 
	 * @param url 统一资源位置符号 
	 */ 
	public FormPoster(URL url) { 
		if(!url.getProtocol().toLowerCase().startsWith("http")) { 
			System.err.println("Post只用于http协议！"); 
			return; 
		} 
		this.url=url; 
	} 
	/** 
	 *  添加参数-值对 
	 * @param name 参数名称 
	 * @param value 参数值 
	 */ 
	public void add(String name,String value) { 
		queryString.add(name, value); 
	} 
	 
	/** 
	 * 获取URL 
	 * @return URL  
	 */ 
	public URL getURL() { 
		return url; 
	} 
	/** 
	 *  获取网站相应的输入流 
	 * @return 输入流 
	 * @throws Exception 无法连接异常 
	 */ 
	public InputStream post() throws Exception { 
		URLConnection openConnection = url.openConnection(); 
		openConnection.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)"); 
		openConnection.setDoOutput(true); 
		OutputStream outputStream = openConnection.getOutputStream(); 
		OutputStreamWriter outputStreamWriter = new OutputStreamWriter(outputStream,"UTF-8"); 
		outputStreamWriter.write(queryString.toString()); 
		outputStreamWriter.write("/r/n"); 
		outputStreamWriter.flush(); 
		outputStreamWriter.close(); //刷新关闭流很重要，只有关闭了，才能获取输入流 
		return openConnection.getInputStream(); 
	} 
}

测试代码

package demo0808.demo2; 
/** 
 * 测试代码 
 */ 
import java.io.File; 
import java.io.FileOutputStream; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.io.OutputStreamWriter; 
import java.net.URL; 
 
public class Test { 
 
	public static void main(String[] args) throws Exception { 
		URL url = new URL("https://uniportal.huawei.com/uniportal/login.do"); 
		FormPoster formPoster = new FormPoster(url); 
		/** 
		 * 以下是测试华为招聘网站登陆界面 
		 */ 
		formPoster.add("actionFlag", "loginAuthenticate"); 
		formPoster.add("lang", "zh"); 
		formPoster.add("redirect", "http://career.huawei.com/recruitment/login_index.html?redirect=http://career.huawei.com/recruitment/"); 
		formPoster.add("uid", "用户名"); 
		formPoster.add("password", "密码`"); 
		InputStream inputStream = formPoster.post(); 
		InputStreamReader inputStreamReader = new InputStreamReader(inputStream); 
		File file=new File("outfile"); 
		FileOutputStream fileOutputStream = new FileOutputStream(file); 
		OutputStreamWriter outputStreamWriter = new OutputStreamWriter(fileOutputStream,"UTF-8"); 
		int c; 
		while((c=inputStreamReader.read())!=-1) { 
			System.out.print((char)c); 
			outputStreamWriter.write((char)c); 
		} 
		inputStream.close(); 
		outputStreamWriter.close(); 
		System.out.println(); 
	} 
}