Jackson 高性能的JSON处理 android/移动开发必备jackson
2011-11-08 20:10
369 查看
今天自行研究了下json ,感觉非常好用,经过测试比google的GSON快多了
同时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。功能非常的强悍!
大家也知道,json 在如今互联网时代应用的非常广,因为大家如此的关注,所以对json的解析性能要求也是非常高的。
一、 准备工作
1、 下载依赖库jar包
Jackson的jar all下载地址:http://jackson.codehaus.org/1.7.6/jackson-all-1.7.6.jar
然后在工程中导入这个jar包即可开始工作
官方示例:http://wiki.fasterxml.com/JacksonInFiveMinutes
因为下面的程序是用junit测试用例运行的,所以还得添加junit的jar包。版本是junit-4.2.8
如果你需要转换xml,那么还需要stax2-api.jar
2、 测试类基本代码如下
打印结果 :
串转换成entity-------------
json2:uid=1000,name=xiao liao,upwd=123,number=12.0,isStudent=true
writeMap2Json -----------
{"2":{"uid":1000,"uname":"xiao liao","upwd":"123","number":12.0,"isstudent":true},"1":{"uid":1000,"uname":"xiao liao","upwd":"123","number":12.0,"isstudent":true}}
readJson2Array------------------
>uid=1,name=www,upwd=456,number=234.0,isStudent=false
>uid=5,name=tom,upwd=123,number=3.44,isStudent=false
writeMap2Json -----------
{"2":{"uid":1000,"uname":"xiao liao","upwd":"123","number":12.0,"isstudent":true},"1":{"uid":1000,"uname":"xiao liao","upwd":"123","number":12.0,"isstudent":true}}
大家逐个自己试试吧 ,上面也是我的测试代码
同时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。功能非常的强悍!
大家也知道,json 在如今互联网时代应用的非常广,因为大家如此的关注,所以对json的解析性能要求也是非常高的。
一、 准备工作
1、 下载依赖库jar包
Jackson的jar all下载地址:http://jackson.codehaus.org/1.7.6/jackson-all-1.7.6.jar
然后在工程中导入这个jar包即可开始工作
官方示例:http://wiki.fasterxml.com/JacksonInFiveMinutes
因为下面的程序是用junit测试用例运行的,所以还得添加junit的jar包。版本是junit-4.2.8
如果你需要转换xml,那么还需要stax2-api.jar
2、 测试类基本代码如下
/* * @project java * @package * @file Jackson.java * @version 1.0 * @author 廖益平 * @time 2011-11-8 上午02:59:37 */ public class Jackson { /* * * Class Descripton goes here. * * @class Jackson * @version 1.0 * @author 廖益平 * @time 2011-11-8 上午02:59:37 */ public static JsonGenerator jsonGenerator = null; private static ObjectMapper mapper = new ObjectMapper(); public static void main(String[] args) { Student student = new Student(); student.setIsstudent(true); student.setUid(1000); student.setUname("xiao liao"); student.setUpwd("123"); student.setNumber(12); Map<String, Student> stuMap = new HashMap<String, Student>(); stuMap.put("1", student); stuMap.put("2", student); List<Object> stuList = new ArrayList<Object>(); List<Student> stuList1 = new ArrayList<Student>(); stuList1.add(student); student= new Student(); student.setIsstudent(false); student.setUid(200); student.setUname("xiao mi"); stuList1.add(student); stuList.add(student); stuList.add("xiao xin"); stuList.add("xiao er"); stuList.add(stuMap); //readJson2List(); try { //readJson2Array(); //writeArray2Json(array); //writeJson2List(); //writeEntity2Json(student); writeJson2Entity(); //writeMap2Json(stuMap); //writeList2Json(stuList1); } catch (IOException e) { e.printStackTrace(); } } /** * * <code>writeEntity2Json</code> * @description: TODO(实体类转换成json) * @param object * @throws IOException * @since 2011-11-8 廖益平 */ public static void writeEntity2Json(Object object) throws IOException { mapper.writeValue( new File("D:\\developSoft\\aaadowload\\testjson1\\lib\\aa.txt"),object ); mapper.writeValue( System.out,object ); } /** * * <code>writeArray2Json</code> * @description: TODO(数组转换成json数组) * @param object * @throws IOException * @since 2011-11-8 廖益平 */ public static void writeArray2Json(Object object) throws IOException { // writeValue具有和writeObject相同的功能 mapper.writeValue( new File("D:\\developSoft\\aaadowload\\testjson1\\lib\\aa.txt"),object ); mapper.writeValue(System.out,object ); } /** * * <code>writeMap2Json</code> * @description: TODO(map对象转换成json对象) * @param object * @throws IOException * @since 2011-11-8 廖益平 */ public static void writeMap2Json(Object object) throws IOException { System.out.println("使用ObjectMapper-----------"); // writeValue具有和writeObject相同的功能 System.out.println("==>"+mapper.writeValueAsString(object)); mapper.writeValue( new File("D:\\developSoft\\aaadowload\\testjson1\\lib\\aamap.txt"),object ); mapper.writeValue( System.out , object ); } /** * * <code>writeList2Json</code> * @description: TODO(list转换成json) * @param object * @throws IOException * @since 2011-11-8 廖益平 */ public static void writeList2Json(Object object) throws IOException { System.out.println("==>"+mapper.writeValueAsString(object)); mapper.writeValue( new File("D:\\developSoft\\aaadowload\\testjson1\\lib\\aamap.txt"),object ); mapper.writeValue( System.out , object ); } /** * * <code>writeJson2Entity</code> * @description: TODO(json转换成实体) * @throws IOException * @since 2011-11-8 廖益平 */ public static void writeJson2Entity() throws IOException { System.out.println("json串转换成entity-------------"); // File file = new File("D:\\developSoft\\aaadowload\\testjson1\\lib\\aa.txt"); // FileInputStream inputStream = new FileInputStream(file); // Student student = mapper.readValue(inputStream,Student.class); // System.out.println(student.toString()); //漂亮输出 //mapper.defaultPrettyPrintingWriter().writeValueAsString(value); String json = "{\"uid\":1000,\"uname\":\"xiao liao\",\"upwd\":\"123\",\"number\":12.0,\"isstudent\":true}"; Student student1 = mapper.readValue(json,Student.class); System.out.println("json2:"+student1.toString()); } /** * * <code>writeJson2List</code> * @description: TODO(json专程list对象) * @throws IOException * @since 2011-11-8 廖益平 */ public static void writeJson2List() throws IOException { System.out.println("json串转换成entity-------------"); File file = new File("D:\\developSoft\\aaadowload\\testjson1\\lib\\aa.txt"); FileInputStream inputStream = new FileInputStream(file); Student student = mapper.readValue(inputStream,Student.class); System.out.println(student.toString()); String json = "[{\"uid\":1000,\"uname\":\"xiao liao\",\"upwd\":\"123\",\"number\":12.0,\"isstudent\":true},{\"uid\":200,\"uname\":\"xiao mi\",\"upwd\":null,\"number\":0.0,\"isstudent\":false}]"; List<LinkedHashMap<String, Object>> s= mapper.readValue(json,List.class); for (int i = 0; i < s.size(); i++) { LinkedHashMap<String, Object> link = s.get(i); Set<String> key = link.keySet(); for (Iterator iterator = key.iterator(); iterator.hasNext();) { String string = (String) iterator.next(); System.out.println(string+"==>"+link.get(string)); } System.out.println("json:"+i+""+s.get(i).toString()); } } /** * JSON转换为List对象 */ public static void readJson2List() { String json = "[{\"uid\":1,\"uname\":\"www\",\"number\":234,\"upwd\":\"456\"}," + "{\"uid\":5,\"uname\":\"tom\",\"number\":3.44,\"upwd\":\"123\"}]"; try { List<LinkedHashMap<String, Object>> list = mapper.readValue( json, List.class); System.out.println(list.size()); for (int i = 0; i < list.size(); i++) { Map<String, Object> map = list.get(i); Set<String> set = map.keySet(); for (Iterator<String> it = set.iterator(); it.hasNext();) { String key = it.next(); System.out.println(key + ":" + map.get(key)); } } } catch (JsonParseException e) { e.printStackTrace(); } catch (JsonMappingException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } /** * JSON转换为List对象 */ public static void readJson2Array() { String json = "[{\"uid\":1,\"uname\":\"www\",\"number\":234,\"upwd\":\"456\"}," + "{\"uid\":5,\"uname\":\"tom\",\"number\":3.44,\"upwd\":\"123\"}]"; try { Student[] students = mapper.readValue(json, Student[].class); for (Student student : students) { System.out.println(">"+student.toString()); } } catch (JsonParseException e) { e.printStackTrace(); } catch (JsonMappingException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } }
打印结果 :
串转换成entity-------------
json2:uid=1000,name=xiao liao,upwd=123,number=12.0,isStudent=true
writeMap2Json -----------
{"2":{"uid":1000,"uname":"xiao liao","upwd":"123","number":12.0,"isstudent":true},"1":{"uid":1000,"uname":"xiao liao","upwd":"123","number":12.0,"isstudent":true}}
readJson2Array------------------
>uid=1,name=www,upwd=456,number=234.0,isStudent=false
>uid=5,name=tom,upwd=123,number=3.44,isStudent=false
writeMap2Json -----------
{"2":{"uid":1000,"uname":"xiao liao","upwd":"123","number":12.0,"isstudent":true},"1":{"uid":1000,"uname":"xiao liao","upwd":"123","number":12.0,"isstudent":true}}
大家逐个自己试试吧 ,上面也是我的测试代码
实体类: /* * @project java * @package * @file Student.java * @version 1.0 * @author 廖益平 * @time 2011-11-8 上午03:01:08 */ public class Student { /* * * Class Descripton goes here. * * @class Student * @version 1.0 * @author 廖益平 * @time 2011-11-8 上午03:01:08 */ private int uid; private String uname; private String upwd; private double number; private boolean isstudent; public int getUid() { return uid; } public void setUid(int uid) { this.uid = uid; } public String getUname() { return uname; } public void setUname(String uname) { this.uname = uname; } public String getUpwd() { return upwd; } public void setUpwd(String upwd) { this.upwd = upwd; } public double getNumber() { return number; } public void setNumber(double number) { this.number = number; } public boolean isIsstudent() { return isstudent; } public void setIsstudent(boolean isstudent) { this.isstudent = isstudent; } @Override public String toString() { return "uid="+uid+",name="+uname+",upwd="+upwd+",number="+number+",isStudent="+isstudent; } }
相关文章推荐
- Jackson 高性能的JSON处理 android/移动开发必备jackson
- Jackson 高性能的JSON处理 ObjectMapper
- Jackson 高性能的JSON处理 ObjectMapper
- 转载 Jackson 高性能的JSON处理 ObjectMapper
- Jackson 高性能的JSON处理 ObjectMapper
- Jackson 高性能的JSON处理 ObjectMapper
- Jackson 高性能的JSON处理 android/移动开发必备jackson .
- Jackson 高性能的JSON处理 ObjectMapper
- Jackson 高性能的JSON处理 android/移动开发必备jackson
- Jackson 高性能的JSON处理 android/移动开发必备jackson
- Jackson 高性能的JSON处理 ObjectMapper
- Jackson 高性能的JSON处理 ObjectMapper
- Jackson 高性能的JSON处理 android(移动)开发必备jackson
- 处理json工具类JacksonUtil
- jackson处理json对象相关小结
- Jackson json 处理全大写或不规范的JSON
- Java JSON处理库Jackson
- FastJson、Jackson、Gson进行Java对象转换Json的细节处理
- Java JSON 处理技术:Jackson