java如何得到GET和POST请求URL和参数列表

转自：http://www.zuidaima.com/share/1550463555308544.htm

在servlet中GET请求可以通过HttpServletRequest的getRequestURL方法和getQueryString()得到完整的请求路径和请求所有参数列表，POST的需要getParameterMap()方法遍历得到，不论GET或POST都可以通过getRequestURL+getParameterMap()来得到请求完整路径

package com.zuidaima	    				
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class GetParams extends HttpServlet {
	private static final long serialVersionUID = 1L;

	public GetParams() {
		super();
	}

	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		PrintWriter writer = response.getWriter();
		writer.println("GET " + request.getRequestURL() + " "
				+ request.getQueryString());

		Map params = request.getParameterMap();
		String queryString = "";
		for (String key : params.keySet()) {
			String[] values = params.get(key);
			for (int i = 0; i < values.length; i++) {
				String value = values[i];
				queryString += key + "=" + value + "&";
			}
		}
		// 去掉最后一个空格
		queryString = queryString.substring(0, queryString.length() - 1);
		writer.println("GET " + request.getRequestURL() + " " + queryString);
	}

	protected void doPost(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		PrintWriter writer = response.getWriter();
		Map params = request.getParameterMap();
		String queryString = "";
		for (String key : params.keySet()) {
			String[] values = params.get(key);
			for (int i = 0; i < values.length; i++) {
				String value = values[i];
				queryString += key + "=" + value + "&";
			}
		}
		// 去掉最后一个空格
		queryString = queryString.substring(0, queryString.length() - 1);
		writer.println("POST " + request.getRequestURL() + " " + queryString);
	}
}