jackson 完整Jar包
标签：现在 close except swa set value 除了 actor utils
Jackson fasterxml和codehaus的区别： 他们是Jackson的两大分支、也是两个版本的不同包名。Jackson从2.0开始改用新的包名fasterxml；
1.x版本的包名是codehaus。除了包名不同，他们的Maven artifact id也不同。1.x版本现在只提供bug-fix，
2.x版本还在不断开发和发布中。如果是新项目，建议直接用2x，即fasterxml jackson。
P.S. Jackson可以轻松的将Java对象转换成json对象和xml文档，同样也可以将json、xml转换成Java对象。
官网：http://wiki.fasterxml.com/JacksonHome 三个主要的模块： jackson-co re：核心包 jackson-annotations：注解包 jackson-databind：数据绑定包 jackson-databind需要引用另外两个包，所以如果项目中需要jackson-databind，则只需要加入它的dependency就行了，其他两个会自动引入： <dependency> <groupId>com.fasterxml.jackson.
使用(java jar-jackson-all-1.9.0jar自行下载)
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.codehaus.jackson.JsonFactory;
import org.codehaus.jackson.JsonGenerator;
import org.codehaus.jackson.JsonParser;
import org.codehaus.jackson.map.DeserializationConfig.Feature;
import org.codehaus.jackson.map.MappingJsonFactory;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.type.JavaType;
public class JsonUtils {
public static String toJson(Map obj) {
String jsonString = "";
try {
if (obj == null) {
return "";
}
StringWriter sw = new StringWriter();
JsonGenerator gen = new JsonFactory().createJsonGenerator(sw);
ObjectMapper mapper = new ObjectMapper();
mapper.writeValue(gen, obj);
jsonString = sw.toString();
sw.close();
} catch (Exception ex) {
ex.printStackTrace();
return "";
}
return jsonString;
}
@SuppressWarnings("unchecked")
public static Map toMap(String json) {
Map result = new HashMap();
try {
if (json == null || json.equals("")) {
return null;
}
ObjectMapper objectMapper = new ObjectMapper();
result = objectMapper.readValue(json, Map.class);
if (result == null) {
return new HashMap();
}
} catch (Exception ex) {
ex.printStackTrace();
}
return result;
}
public static String toJson(Object object) {
String json = "";
try {
if (object == null) {
return "";
}
StringWriter sw = new StringWriter();
JsonGenerator gen = new JsonFactory().createJsonGenerator(sw);
ObjectMapper mapper = new ObjectMapper();
mapper.writeValue(gen, object);
json = sw.toString();
sw.close();
} catch (Exception ex) {
ex.printStackTrace();
json = "";
}
return json;
}
public static T toObject(String json, Class clazz) {
T obj = null;
try {
if (json == null || json.equals("")) {
return null;
}
JsonFactory jsonFactory = new MappingJsonFactory();
JsonParser jsonParser = jsonFactory.createJsonParser(json);
ObjectMapper mapper = new ObjectMapper();
mapper.configure(Feature.FAIL_ON_UNKNOWN_PROPERTIES,false);
//mapper.getDeserializationConfig().set(Feature.FAIL_ON_UNKNOWN_PROPERTIES, false);
obj = mapper.readValue(jsonParser, clazz);
} catch (Exception ex) {
ex.printStackTrace();
obj = null;
}
return obj;
}
public static List toList(String json, Class clazz) {
if (json == null || json.equals("")) {
return null;
}
ObjectMapper mapper = new ObjectMapper();
mapper.configure(Feature.FAIL_ON_UNKNOWN_PROPERTIES,false);
List list = new ArrayList();
try {
JavaType type = mapper.getTypeFactory().constructParametricType(List.class, clazz);
list = mapper.readValue(json, type);
return list;
} catch (Exception e) {
e.printStackTrace();
}
return list;
}
}
jackson 完整Jar包
标签：现在 close except swa set value 除了 actor utils
原文地址：https://www.cnblogs.com/fanblogs/p/11153010.html
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