json的工具: jackson的使用
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Java代码 package com.rh.util; import com.fasterxml.jackson.core.JsonFactory; import com.fasterxml.jackson.core.JsonGenerator; import com.fasterxml.jackson.core.type.TypeReference; import com.fasterxml.jackson.databind.JavaType; import com.fasterxml.jackson.databind.ObjectMapper; import java.io.StringWriter; import java.util.ArrayList; import java.util.List; import java.util.Map; /** * Created with IntelliJ IDEA. User: pandy Date: 13-7-6 Time: 下午5:26 To change * this template use File | Settings | File Templates. */ public class JSONUtils { private static ObjectMapper getObjectMapper() { ObjectMapper mapper = new ObjectMapper(); return mapper; } public static String bean2str(Object obj) { try { ObjectMapper mapper = getObjectMapper(); StringWriter writer = new StringWriter(); JsonGenerator gen = new JsonFactory().createJsonGenerator(writer); mapper.writeValue(gen, obj); gen.close(); String json = writer.toString(); writer.close(); return json; } catch (Exception e) { e.printStackTrace(); return null; } } public static Object str2bean(String json, Class<?> clazz) { try { ObjectMapper mapper = getObjectMapper(); Object domain = mapper.readValue(json, clazz); return domain; } catch (Exception e) { e.printStackTrace(); return null; } } public static Object str2list(String json, TypeReference valueTypeRef) { try { ObjectMapper mapper = getObjectMapper(); Object domain = mapper.readValue(json, valueTypeRef); return domain; } catch (Exception e) { e.printStackTrace(); return null; } } public static Object str2list(String json, Class<?> clazz) { try { ObjectMapper mapper = getObjectMapper(); JavaType type = mapper.getTypeFactory().constructCollectionType(ArrayList.class, clazz); Object domain = mapper.readValue(json, type); return domain; } catch (Exception e) { e.printStackTrace(); return null; } } // new TypeReference<Map<String,Object>>() { } public static Object str2map(String json, TypeReference valueTypeRef) { try { ObjectMapper mapper = getObjectMapper(); Object domain = mapper.readValue(json, valueTypeRef); return domain; } catch (Exception e) { e.printStackTrace(); return null; } } public static Map<String, Object> str2map(String json) { try { ObjectMapper mapper = getObjectMapper(); Map<String, Object> domain = mapper.readValue(json, new TypeReference<Map<String, Object>>() { }); return domain; } catch (Exception e) { e.printStackTrace(); return null; } } public static String list2JsonString(List l) { StringWriter sw = new StringWriter(); try { ObjectMapper mapper = getObjectMapper(); mapper.writeValue(sw, l); } catch (Exception e) { e.printStackTrace(); } return sw.toString(); } public static Object map2bean(Map map, Class<?> clazz) { String json = map2str(map); try { ObjectMapper mapper = getObjectMapper(); Object domain = mapper.readValue(json, clazz); return domain; } catch (Exception e) { e.printStackTrace(); return null; } } public static String map2str(Map map) { StringWriter sw = new StringWriter(); try { ObjectMapper mapper = getObjectMapper(); mapper.writeValue(sw, map); } catch (Exception e) { e.printStackTrace(); } return sw.toString(); } public static Map bean2map(Object o){ String s = bean2str(o); Map map = str2map(s); return map; } } |
