ObjectMapper 将其他对象转换为json

来源：互联网发布：炎锤网络编辑：程序博客网时间：2024/06/03 09:27

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.StringWriter;
import java.net.URL;
import java.text.SimpleDateFormat;

import javax.servlet.http.HttpServletResponse;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;

/**
*
*<p>
* <ol style='font-size:12px'>
* <li>
* Describe ：
* </li>
* <li>Write date ：2011-3-31</li>
* <li>
* Developer ：<a href='MailTo:abc-127@qq.com' title='Send to the E-mail'>English name is Fd wang</a>
* </li>
* <li>Company ： </li>
* </ol>
*</p>
*/
public class JsonFormater {

   private static ObjectMapper mapper=new ObjectMapper();

   private static SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
   static {
       mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
       mapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
       mapper.configure(JsonParser.Feature.ALLOW_COMMENTS, true);
       mapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
       mapper.setDateFormat(format);
   }
   public static String getJsonValue(Object object) {

       StringWriter writer=null;
       try {
           writer=new StringWriter();
           mapper.writeValue(writer,object);
           writer.flush();
           return writer.toString();
       } catch (Exception e) {
           throw new RuntimeException("JSON 格式化出错",e);
       }finally{
           try {
               writer.close();
           } catch (IOException e) {
               e.printStackTrace();
           }
       }
   }
   public static <T> T toObject(String url,Class<T> clazz){
       try {
           return mapper.readValue(url, clazz);
       } catch (JsonParseException e) {
           throw new RuntimeException("JSON 格式化出错",e);
       } catch (JsonMappingException e) {
           throw new RuntimeException("JSON 格式化出错",e);
       } catch (IOException e) {
           throw new RuntimeException("网络连接异常",e);
       }

   }
   public static String getJsonValue(ObjectMapper objectMapper,Object object) {
       StringWriter writer=null;
       try {
           writer=new StringWriter();
           if(objectMapper==null){
               mapper.writeValue(writer, object);
           }else{
               objectMapper.writeValue(writer, object);
           }
           writer.flush();
           return writer.toString();
       }catch (Exception e) {
               throw new RuntimeException("JSON 格式化出错",e);
           }finally{
               try {
                   writer.close();
               } catch (IOException e) {
                   e.printStackTrace();
               }
       }
   }

   public static boolean writeJsonValue(ObjectMapper objectMapper,OutputStream os,Object object) {
        boolean bool=true;
        try {
           if(objectMapper==null){
              mapper.writeValue(os, object);
          }else{
              objectMapper.writeValue(os, object);
          }
           os.flush();
       } catch (Exception e) {
           throw new RuntimeException("JSON 格式化出错",e);
       }
       return bool;
   }
   public static boolean writeJsonValue(OutputStream os,Object object) {
        boolean bool=true;
       try {
           mapper.writeValue(os, object);
           os.flush();
       } catch (Exception e) {
           throw new RuntimeException("JSON 格式化出错",e);
       }
       return bool;
   }
   public static boolean writeJsonValue(HttpServletResponse response,Object object) {
       return writeJsonValue(null,response, object);
   }
   public static boolean writeJsonValue(ObjectMapper objectMapper,HttpServletResponse response,Object object) {
       response.setContentType("text/html;charset=UTF-8");
       boolean bool=true;
        if(objectMapper==null){
           objectMapper=mapper;
       }
        try {
           objectMapper.writeValue(response.getOutputStream(), object);
       } catch (Exception e) {
           throw new RuntimeException("JSON 格式化出错",e);
       }
       return bool;
   }
   public static <T> T readValueFromURL(String url,Class<T> clasz){

       try {
           return mapper.readValue(new URL(url), clasz);
       } catch (JsonParseException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       } catch (JsonMappingException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       } catch (IOException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }
       return null;
   }

   public static <T> T readValueFromStream(InputStream in,TypeReference<T> valueTypeRef){

       try {
           return (T)mapper.readValue(in, valueTypeRef);
       } catch (JsonParseException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       } catch (JsonMappingException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       } catch (IOException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }
       return null;
   }


}

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