JSON返回输出JSON字符串工具类

短命女 2022-04-18 00:43 359阅读 0赞

**通过HttpServletResponse JSON返回输出JSON字符串工具类，常用的工具类**

import java.io.PrintWriter;
    import java.util.HashMap;
    import java.util.Map;
    
    import javax.servlet.http.HttpServletResponse;
    
    import org.apache.commons.lang3.StringEscapeUtils;
    import org.apache.log4j.Logger;
    
    import com.alibaba.fastjson.JSONObject;
    
    /**
     * 
     * @value JSON 工具类
     *
     */
    public class JsonUtilCode {
    
    	private static Logger log = Logger.getLogger(JsonUtilCode.class);
    
    	private static Map<String, Object> mapCode = new HashMap<>();
    
    	/**
    	 * 系统编码
    	 */
    	private final static String ENCODE = "UTF-8";
    
    	/**
    	 * 系统代码 成功
    	 */
    	public final static int SUCCESS = 0;
    
    	/**
    	 * 系统代码 失败
    	 */
    	public final static int FAILURE = 1;
    
    	/**
    	 * @value 输出json信息
    	 * 
    	 * @param json
    	 * @param response
    	 */
    	public static void writeJson(JSONObject json, HttpServletResponse response) {
    		response.setHeader("Access-Control-Allow-Origin", "*");// 设置响应头，为刷新“refresh”
    		response.setContentType("text/html;charset=" + ENCODE);// 设置返回客户端的编码
    		response.setCharacterEncoding(ENCODE);// 往请求里面添加状态
    		PrintWriter out = null;// 字节流
    		try {
    			out = response.getWriter();
    		} catch (Exception e) {
    			// TODO: handle exception
    			log.error("系统错误", e);
    			json.put("code", FAILURE);
    			json.put("msg", "系统错误：" + e.getMessage());
    		} finally {
    			if (out != null) {
    				out.write(json.toString());
    				out.close();
    				out = null;
    			}
    		}
    	}
    
    	/**
    	 * @value 字符串输出json信息
    	 * 
    	 * @param parameter
    	 * @param response
    	 */
    	public static void writeJson(String parameter, HttpServletResponse response) {
    		JSONObject json = new JSONObject();
    		response.setHeader("Access-Control-Allow-Origin", "*");
    		response.setContentType("text/html;charset=" + ENCODE);
    		response.setCharacterEncoding(ENCODE);
    		PrintWriter out = null;// 字节流
    		try {
    			out = response.getWriter();
    		} catch (Exception e) {
    			// TODO: handle exception
    			log.error("系统错误", e);
    			json.put("code", FAILURE);
    			json.put("msg", "系统错误：" + e.getMessage());
    		} finally {
    			if (out != null) {
    				String JsonString = StringEscapeUtils.unescapeJava(parameter);
    				out.write(JsonString);
    				out.close();
    				out = null;
    			}
    		}
    	}
    }

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