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2023-04-14 cc0cbfc79a34e1b106fdb998450cd2ad03446126
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58d006 1 package com.mandi.common;
A 2
3 import java.io.IOException;
4 import java.io.StringWriter;
5 import java.text.SimpleDateFormat;
6 import java.util.List;
7
8 import com.fasterxml.jackson.core.JsonFactory;
9 import com.fasterxml.jackson.core.JsonGenerator;
10 import com.fasterxml.jackson.core.JsonParseException;
11 import com.fasterxml.jackson.databind.JavaType;
12 import com.fasterxml.jackson.databind.JsonMappingException;
13 import com.fasterxml.jackson.databind.ObjectMapper;
14
15 public class Jacksonmethod {
16     private static ObjectMapper m=new ObjectMapper();
17     private static JsonFactory jf=new JsonFactory();
18     public static <T> Object fromjson(String jsonstr,Class<T> pojoclass){
19         T pojo=null;
20         try {
21             pojo=m.readValue(jsonstr, pojoclass);
22         } catch (JsonParseException e) {
23             System.out.println("jackson解析错误:"+jsonstr);
24         } catch (JsonMappingException e) {
25             e.printStackTrace();
26         } catch (IOException e) {
27             e.printStackTrace();
28         }
29         return pojo;
30     }
31     public static <T> List<T> fromjsontolist(String jsonstr,Class<T> t){
32         //TypeReference<List<T>> typer=new TypeReference<List<T>>(){};
33         if(jsonstr==null)
34             return null;
35         m.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
36         JavaType javaType = m.getTypeFactory().constructParametricType(List.class, t);
37         List<T> pojos=null;
38         try {
39             pojos=(List<T>)(List<?>)m.readValue(jsonstr, javaType);
40         } catch (JsonParseException e) {
41             System.out.println("jackson解析错误:");
42             e.printStackTrace();
43         } catch (JsonMappingException e) {
44             e.printStackTrace();
45         } catch (IOException e) {
46             e.printStackTrace();
47         }
48         return pojos;
49     }
50     public static String tojson(Object pojo, boolean prettyPrint)
51     {
52         String str="";
53         StringWriter writer=new StringWriter();
54         try {
55             JsonGenerator jg=jf.createGenerator(writer);
56             if(prettyPrint)
57                 jg.useDefaultPrettyPrinter();
58             m.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm"));
59             m.writeValue(jg, pojo);
60             str=writer.toString();
61         } catch (IOException e) {
62             // TODO Auto-generated catch block
63             e.printStackTrace();
64         }
65         return str;
66     }
67     public static String tojson_date(Object pojo, boolean prettyPrint)
68     {
69         String str="";
70         StringWriter writer=new StringWriter();
71         try {
72             JsonGenerator jg=jf.createGenerator(writer);
73             if(prettyPrint)
74                 jg.useDefaultPrettyPrinter();
75             m.setDateFormat(new SimpleDateFormat("yyyy-MM-dd"));
76             m.writeValue(jg, pojo);
77             str=writer.toString();
78         } catch (IOException e) {
79             // TODO Auto-generated catch block
80             e.printStackTrace();
81         }
82         return str;
83     }
84 }