fastjson json字串和JavaBean、List、Map及複雜集合型別的相互轉換。
本文主要示例兩部分內容:
- JavaBean、List、Map、複雜集合 轉換成 json字串;
- json字串 轉換成 JavaBean、List、Map、複雜集合;
定義POJO:
public class A {
private String usename;
private String password;
public A() {
}
public A(String usename, String password) {
this.usename = usename;
this.password = password;
}
public String getUsename() {
return usename;
}
public void setUsename(String usename) {
this.usename = usename;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
開始轉換測試:
public static void main(String[] args) {
//javaBean 轉 json字串
A a1 = new A("wei.hu", "123456");
String a1Json = JSON.toJSONString(a1);
System.out.println(a1Json);
//List<JavaBean> 轉 json字串
A a2 = new A("mengna.shi", "123456");
A a3 = new A("ming.li", "567890");
List<A> aList = Lists.newArrayList(a1, a2, a3);
String aListJson = JSON.toJSONString(aList);
System.out.println(aListJson);
//List<String> 轉 json字串
List<String> stringList = Lists.newArrayList("wei.hu", "mengna.shi", "fastJson");
String stringListJson = JSON.toJSONString(stringList);
System.out.println(stringListJson);
//List<Integer> 轉 json字串
List<Integer> integerList = Lists.newArrayList(10, 9, 8, 7);
String integerListJson = JSON.toJSONString(integerList);
System.out.println(integerListJson);
//Map<String, A> 轉 json字串
Map<String, A> aMap = Maps.newHashMap();
aMap.put("a1", a1);
aMap.put("a2", a2);
aMap.put("a3", a3);
String aMapJson = JSON.toJSONString(aMap);
System.out.println(aMapJson);
//Map<String, String> 轉 json字串
Map<String, String> stringMap = Maps.newHashMap();
stringMap.put("name", "wei.hu");
stringMap.put("gender", "man");
stringMap.put("age", "18");
String stringMapJson = JSON.toJSONString(stringMap);
System.out.println(stringMapJson);
//Map<String, Integer> 轉 json字串
Map<String, Integer> integerMap = Maps.newHashMap();
integerMap.put("int1",18);
integerMap.put("int2", 19);
integerMap.put("int3", 20);
String integerMapJson = JSON.toJSONString(integerMap);
System.out.println(integerMapJson);
//Map<String, Object> 轉 json字串
Map<String, Object> objectMap = Maps.newHashMap();
objectMap.put("name", "wei.hu");
objectMap.put("gender", "man");
objectMap.put("age", 18);
String objectMapJson = JSON.toJSONString(objectMap);
System.out.println(objectMapJson);
//List<Map<String,Object>> 轉 json字串
Map<String, A> aMap1 = Maps.newHashMap();
aMap1.put("a1", a1);
aMap1.put("a2", a2);
List<Map<String, A>> aList1 = Lists.newArrayList();
aList1.add(aMap);
aList1.add(aMap1);
String complexJson1 = JSON.toJSONString(aList1);
System.out.println(complexJson1);
//Map<String, List<JavaBean>> 轉 json字串
List<A> aList2 = Lists.newArrayList(a1, a2);
List<A> aList3 = Lists.newArrayList(a2, a3);
Map<String, List<A>> listMap = Maps.newHashMap();
listMap.put("key1", aList2);
listMap.put("key2", aList3);
String complexJson2 = JSON.toJSONString(listMap);
System.out.println(complexJson2);
//json字串 轉 javaBean
String jsonString1 = "{\"password\":\"123456\",\"usename\":\"wei.hu\"}";
A aa1 = JSON.parseObject(jsonString1, A.class);
System.out.println(aa1.getUsename() + " / " + aa1.getPassword());
//json字串 轉 List<JavaBean>
String jsonString2 = "[{\"password\":\"123456\",\"usename\":\"wei.hu\"},{\"password\":\"123456\",\"usename\":\"mengna.shi\"},{\"password\":\"567890\",\"usename\":\"ming.li\"}]";
List<A> aList4 = JSON.parseArray(jsonString2, A.class);
System.out.println(aList4.size());
//json字串 轉 List<String>
String jsonString3 = "[\"wei.hu\",\"mengna.shi\",\"fastJson\"]";
List<String> stringList1 = JSON.parseArray(jsonString3, String.class);
System.out.println(stringList1.size());
//json字串 轉 List<Integer>
String jsonString4 = "[10,9,8,7]";
List<Integer> integerList1 = JSON.parseArray(jsonString4, Integer.class);
System.out.println(integerList1.size());
//json字串轉 Map<String, Object>
String jsonString5 = "{\"a1\":{\"password\":\"123456\",\"usename\":\"wei.hu\"},\"a2\":{\"password\":\"123456\",\"usename\":\"mengna.shi\"},\"a3\":{\"password\":\"567890\",\"usename\":\"ming.li\"}}";
Map<String, Object> stringObjectMap = JSON.parseObject(jsonString5, Map.class);
System.out.println(stringObjectMap.size());
//json字串 轉 List<Map<String, A>>
String jsonString6 = "[{\"a1\":{\"password\":\"123456\",\"usename\":\"wei.hu\"},\"a2\":{\"password\":\"123456\",\"usename\":\"mengna.shi\"},\"a3\":{\"password\":\"567890\",\"usename\":\"ming.li\"}},{\"a1\":{\"$ref\":\"$[0].a1\"},\"a2\":{\"$ref\":\"$[0].a2\"}}]";
List<Map<String, A>> mapList = JSON.parseObject(jsonString6, new TypeReference<List<Map<String, A>>>(){});
System.out.println("mapList.size():" + mapList.size());
//json字串 轉 Map<String, List<A>>
String jsonString7 = "{\"key1\":[{\"password\":\"123456\",\"usename\":\"wei.hu\"},{\"password\":\"123456\",\"usename\":\"mengna.shi\"}],\"key2\":[{\"$ref\":\"$.key1[1]\"},{\"password\":\"567890\",\"usename\":\"ming.li\"}]}";
Map<String, List<A>> listMap1 = JSON.parseObject(jsonString7, new TypeReference<Map<String, List<A>>>() {});
System.out.println("listMap1.size():" + listMap1.size());
//json字串 轉 List<Map<String, List<A>>>
A aaa1 = new A("wei.hu", "123456");
A aaa2 = new A("mengna.shi", "abcdef");
A aaa3 = new A("admin", "098765");
List<A> myAList1 = Lists.newArrayList(aaa1, aaa2, aaa3);
A aaa4 = new A("song.xu", "28");
A aaa5 = new A("jielun.zhou", "36");
List<A> myAList2 = Lists.newArrayList(aaa4, aaa5);
Map<String, List<A>> myMap1 = Maps.newHashMap();
myMap1.put("myAList1", myAList1);
myMap1.put("myAList2", myAList2);
A aaa6 = new A("junjie.lin", "61");
A aaa7 = new A("jian.xiao", "31");
A aaa8 = new A("xi.ben", "32");
List<A> myAList3 = Lists.newArrayList(aaa6, aaa7, aaa8);
Map<String, List<A>> myMap2 = Maps.newHashMap();
myMap2.put("myAList3", myAList3);
A aaa9 = new A("xing.qun", "33");
A aaa10 = new A("datong.fang", "34");
A aaa11 = new A("dun.tong", "35");
List<A> myAList4 = Lists.newArrayList(aaa9, aaa10, aaa11);
Map<String, List<A>> myMap3 = Maps.newHashMap();
myMap3.put("myAList4", myAList4);
List<Map<String, List<A>>> list = Lists.newArrayList(myMap1, myMap2, myMap3);
System.out.println(JSON.toJSONString(list));
List<Map<String, List<A>>> newList = JSON.parseObject(JSON.toJSONString(list), new TypeReference<List<Map<String, List<A>>>>() {});
System.out.println("newList.size():" + newList.size());
//josn字串 轉 Map<String, List<Map<String, A>>>
A objectA1 = new A("1", "1");
A objectA2 = new A("2", "2");
A objectA3 = new A("3", "3");
Map<String, A> newMap1 = Maps.newHashMap();
newMap1.put("objectA1", objectA1);
newMap1.put("objectA2", objectA2);
newMap1.put("objectA3", objectA3);
A objectA4 = new A("4", "4");
A objectA5 = new A("5", "5");
A objectA6 = new A("6", "6");
Map<String, A> newMap2 = Maps.newHashMap();
newMap2.put("objectA4", objectA4);
newMap2.put("objectA5", objectA5);
newMap2.put("objectA6", objectA6);
List<Map<String, A>> newList1 = Lists.newArrayList(newMap1, newMap2);
A objectA7 = new A("7", "7");
A objectA8 = new A("8", "8");
Map<String, A> newMap3 = Maps.newHashMap();
newMap3.put("objectA7", objectA7);
newMap3.put("objectA8", objectA8);
List<Map<String, A>> newList2 = Lists.newArrayList(newMap3);
A objectA9 = new A("9", "9");
A objectA0 = new A("0", "0");
Map<String, A> newMap4 = Maps.newHashMap();
newMap4.put("objectA9", objectA9);
newMap4.put("objectA0", objectA0);
List<Map<String, A>> newList3 = Lists.newArrayList(newMap4);
Map<String, List<Map<String, A>>> map = Maps.newHashMap();
map.put("newList1", newList1);
map.put("newList2", newList2);
map.put("newList3", newList3);
System.out.println(JSON.toJSONString(map));
Map<String, List<Map<String, A>>> newMap = JSON.parseObject(JSON.toJSONString(map), new TypeReference<Map<String, List<Map<String, A>>>>() {});
System.out.println("newMap.size()" + newMap.size());
}
輸出:
{"password":"123456","usename":"wei.hu"}
[{"password":"123456","usename":"wei.hu"},{"password":"123456","usename":"mengna.shi"},{"password":"567890","usename":"ming.li"}]
["wei.hu","mengna.shi","fastJson"]
[10,9,8,7]
{"a1":{"password":"123456","usename":"wei.hu"},"a2":{"password":"123456","usename":"mengna.shi"},"a3":{"password":"567890","usename":"ming.li"}}
{"gender":"man","name":"wei.hu","age":"18"}
{"int2":19,"int1":18,"int3":20}
{"gender":"man","name":"wei.hu","age":18}
[{"a1":{"password":"123456","usename":"wei.hu"},"a2":{"password":"123456","usename":"mengna.shi"},"a3":{"password":"567890","usename":"ming.li"}},{"a1":{"$ref":"$[0].a1"},"a2":{"$ref":"$[0].a2"}}]
{"key1":[{"password":"123456","usename":"wei.hu"},{"password":"123456","usename":"mengna.shi"}],"key2":[{"$ref":"$.key1[1]"},{"password":"567890","usename":"ming.li"}]}
wei.hu / 123456
3
3
4
3
mapList.size():2
listMap1.size():2
[{"myAList2":[{"password":"28","usename":"song.xu"},{"password":"36","usename":"jielun.zhou"}],"myAList1":[{"password":"123456","usename":"wei.hu"},{"password":"abcdef","usename":"mengna.shi"},{"password":"098765","usename":"admin"}]},{"myAList3":[{"password":"61","usename":"junjie.lin"},{"password":"31","usename":"jian.xiao"},{"password":"32","usename":"xi.ben"}]},{"myAList4":[{"password":"33","usename":"xing.qun"},{"password":"34","usename":"datong.fang"},{"password":"35","usename":"dun.tong"}]}]
newList.size():3
{"newList3":[{"objectA9":{"password":"9","usename":"9"},"objectA0":{"password":"0","usename":"0"}}],"newList2":[{"objectA7":{"password":"7","usename":"7"},"objectA8":{"password":"8","usename":"8"}}],"newList1":[{"objectA2":{"password":"2","usename":"2"},"objectA3":{"password":"3","usename":"3"},"objectA1":{"password":"1","usename":"1"}},{"objectA6":{"password":"6","usename":"6"},"objectA4":{"password":"4","usename":"4"},"objectA5":{"password":"5","usename":"5"}}]}
newMap.size()3
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