从HttpServletRequest获取参数_application/json 获取参数

如何从HttpServletRequest中获取参数

package com.game.common.http.base;

import java.io.IOException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

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

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import com.alibaba.fastjson.JSONObject;


/**
 * 公共的action
 * 
 * @author administrator
 *
 */
public abstract class BaseActionServlet {


	/**
	 * 获取Ip
	 * 
	 * @return
	 */
	public String getIpAddr(HttpServletRequest request) {
		String ip = request.getHeader("x-forwarded-for");
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getHeader("Proxy-Client-IP");
		}
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getHeader("WL-Proxy-Client-IP");
		}
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
			ip = request.getRemoteAddr();
		}
		return ip;
	}
	
	/**
	 * 回传参数
	 * 
	 * @param response
	 * @param code
	 * @param message
	 */
	public static void responseCode(HttpServletResponse response, String code, String message) {
		try {
			response.setCharacterEncoding("utf-8");
			response.setContentType("text/html");
			PrintWriter out = response.getWriter();
			JSONObject json = new JSONObject();
			json.put("code", code);
			json.put("message", message);
			out.print(json.toString());
			out.flush();
			out.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	/**
	 * 回传参数
	 * 
	 * @param response
	 * @param code
	 * @param message
	 */
	public static void responseCode(HttpServletResponse response, int code, String message) {
		try {
			response.setCharacterEncoding("utf-8");
			response.setContentType("text/html");
			PrintWriter out = response.getWriter();
			JSONObject json = new JSONObject();
			json.put("code", code);
			json.put("message", message);
			out.print(json.toString());
			out.flush();
			out.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	/**
	 * 回传参数
	 * 
	 * @param response
	 * @param code
	 * @param message
	 */
	public static void responseCode(HttpServletResponse response, Map<String, String> params, int code,
			String message) {
		try {
			response.setCharacterEncoding("utf-8");
			response.setContentType("text/html");
			PrintWriter out = response.getWriter();
			JSONObject json = new JSONObject();
			json.put("code", code);
			json.put("message", message);

			if (null != params) {
				params.forEach((k, v) -> {
					json.put(k, v);
				});
			}

			out.print(json.toString());
			out.flush();
			out.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 回传参数
	 * 
	 * @param resp
	 *            回传类
	 * @param data
	 *            回传数据
	 * @throws IOException
	 */
	public static void responseData(HttpServletResponse response, String data) {
		try {
			response.setCharacterEncoding("utf-8");
			response.setContentType("text/html");
			PrintWriter out = response.getWriter();
			out.print(data);
			out.flush();
			out.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 回传参数
	 * 
	 * @param resp
	 * @param errorCode
	 *            错误码
	 * @throws IOException
	 */
	public static void responseData(HttpServletResponse response, int errorCode) {
		JSONObject json = new JSONObject();
		json.put("Result", 0);
		json.put("ErrorCode", errorCode);
		responseData(response, json.toString());
	}

	/**
	 * 回传参数
	 * 
	 * @param resp
	 * @param code
	 *            状态码
	 * @throws IOException
	 */
	public static void responseCode(HttpServletResponse response, int code) {
//		JSONObject json = new JSONObject();
//		json.put("code", code);
		String str="{\"code\":"+code+"}";
		responseData(response, str);
	}

	/**
	 * 回传参数
	 * 
	 * @param resp
	 * @param errorCode
	 *            错误码
	 * @throws IOException
	 */
	public static void responseDataSuccess(HttpServletResponse response) {
		JSONObject json = new JSONObject();
		json.put("Result", 1);
		json.put("ErrorCode", 1);
		responseData(response, json.toString());
	}

	/**
	 * 回传参数,data参数格式key1,value1,key2,value2,key3,value3.....,数据会自动封装成json
	 * 
	 * @param resp
	 * @param data
	 *            格式key1,value1,key2,value2,key3,value3.....
	 * @throws IOException
	 */
	public static void responseDatas(HttpServletResponse resp, String... data) {
		JSONObject json = new JSONObject();
		if (null != data && data.length > 0) {
			for (int i = 0; i < data.length; i = i + 2) {
				json.put(data[i], data[i + 1]);
			}
		}
		responseData(resp, json.toString());
	}
	
	
	/**
	 * 回传参数
	 * 
	 * @param resp
	 *            回传类
	 * @param data
	 *            json回传数据
	 * @throws IOException
	 */
	public static void responseData(HttpServletResponse response, JSONObject data) {
		String str="";
		if(null!=data){
			str=data.toString();
		}
		responseData(response,str);
	}
	

	/**
	 * 将参数字符串转换为Map<paramKey,paramValue> eg.
	 * xxKey=xxValue&yyKey=yyValue&zzKey=zzValue -->
	 * Map{xxKey=xxValue,yyKey=yyValue,zzKey=zzValue}
	 * 
	 * @param request
	 *            要转换的字符串
	 * @param bools
	 *            是否第一次读取参数(true 非第一读取参数返回现有paramMap , 空值或false 重新读取paramMap)
	 * @return Map
	 * @throws UnsupportedEncodingException
	 * @throws FileUploadException 
	 */
	@SuppressWarnings({ "unchecked", "rawtypes" })
	public static Map<String, String> getParameters(HttpServletRequest request) throws UnsupportedEncodingException {

		// 参数Map
		Map<String, String[]> properties = request.getParameterMap();
		// 返回值Map
		Map<String, String> returnMap = new HashMap<String, String>();
		Iterator<?> entries = properties.entrySet().iterator();
		Map.Entry entry;
		String name = "";
		String value = null;
		while (entries.hasNext()) {
			entry = (Map.Entry) entries.next();
			name = (String) entry.getKey();
			Object valueObj = entry.getValue();
			if (null == valueObj) {

			} else if (valueObj instanceof String[]) {
				String[] values = (String[]) valueObj;
				for (int i = 0; i < values.length; i++) {
					value = values[i] + ",";
				}
				value = value.substring(0, value.length() - 1);
			} else {
				value = valueObj.toString().trim();
			}
			returnMap.put(name, value);
		}

		return returnMap;
	}

	/**
	 * 将参数字符串转换为Map<paramKey,paramValue> eg.
	 * xxKey=xxValue&yyKey=yyValue&zzKey=zzValue -->
	 * Map{xxKey=xxValue,yyKey=yyValue,zzKey=zzValue}
	 * 
	 * (处理multipart/form-data类型的表单请求)
	 * @param request
	 *            要转换的字符串
	 * @param bools
	 *            是否第一次读取参数(true 非第一读取参数返回现有paramMap , 空值或false 重新读取paramMap)
	 * @return Map
	 * @throws UnsupportedEncodingException
	 * @throws FileUploadException
	 */
	@SuppressWarnings({ "unchecked", "rawtypes" })
	public static Map<String, String> getParametersForMultipartFormData(HttpServletRequest request)
			throws UnsupportedEncodingException, FileUploadException {
		Map<String, String> returnMap = new HashMap<String, String>();
		
		// 返回值Map
		// 文件上传的三部曲
		// 创建工厂
		DiskFileItemFactory factoy = new DiskFileItemFactory();
		// 创建解析器
		ServletFileUpload sfu = new ServletFileUpload(factoy);
		// 设置上传文件的大小
		sfu.setFileSizeMax(20 * 1024);
		// 解析request
		List<FileItem> list = sfu.parseRequest(request);

		// 只处理非文件内容
		for (FileItem fi : list) {
			if (fi.isFormField()) {//只要普通字段,不要文件
				returnMap.put(fi.getFieldName(), fi.getString());
			}
		}
		return returnMap;
	}
	
	/**
	 * 获取参数
	 * @param request
	 * @return
	 * @throws UnsupportedEncodingException
	 * @throws FileUploadException
	 */
	public static Map<String, String> getParams(HttpServletRequest request) throws UnsupportedEncodingException, FileUploadException{
		Map<String,String> params=getParameters(request);
		if(params.size()>0){
			return params;
		}
		return getParametersForMultipartFormData(request);
	}
	

}
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方法：
public static Map<String, String> getParameters(HttpServletRequest request)；
解释：从request.getParameterMap()里获取请求参数

方法：
public static Map<String, String> getParametersForMultipartFormData(HttpServletRequest request)；
解释：通过上传解析器的形式发送请求参数

传送门

获取body里的请求内容