使用Gson对json解析字符串,转化为json对象.
先上代码: 下面是main方法里面的代码
package testJava;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import com.google.gson.JsonParser;
import com.google.gson.JsonArray;
import com.google.gson.JsonObject;
public class TestJava {
public static void main(String[] args) {
// TODO Auto-generated method stub
jsoaArraySort();
}
public static void jsoaArraySort() {
String arrayData = "["
+ "{\"Name\":\"TVS\",\"No\":" + 202 + ",\"Length\":" + 23 + "},"
+ "{\"Name\":\"TVC\",\"No\":" + 203 + ",\"Length\":" + 14 + "},"
+ "{\"Name\":\"Wel\",\"No\":" + 345 + ",\"Length\":" + 35 + "},"
+ "{\"Name\":\"Sma\",\"No\":" + 678 + ",\"Length\":" + 45 + "},"
+ "{\"Name\":\"Sma\",\"No\":" + 136 + ",\"Length\":" + 15 + "},"
+ "{\"Name\":\"Cus\",\"No\":" + 257 + ",\"Length\":" + 17 + "},"
+ "{\"Name\":\"And\",\"No\":" + 678 + ",\"Length\":" + 16 + "},"
+ "{\"Name\":\"Roo\",\"No\":" + 136 + ",\"Length\":" + 56 + "}"
+"]";
JsonParser parser = new JsonParser();
JsonArray jsonArray = parser.parse(arrayData).getAsJsonArray();
System.out.println("init jsonArray=" + jsonArray.toString());
JsonArray sort_JsonArray = new JsonArray();
List<JsonObject> list = new ArrayList<JsonObject>();
JsonObject jsonObj = null;
for (int i = 0; i < jsonArray.size(); i++) {
jsonObj = (JsonObject) jsonArray.get(i);
list.add(jsonObj);
}
//这里最核心的地方就是SortComparator这个类
//其中构造方法的参数:
//sortItem是要排序的jsonArray中一个元素, 这里我选择是Name, 也可以选择No或者是Length
//sortType是排序的类型, 有三种情况
// 1. 排序的元素对应的值是int， 那么sortType = "int";
// 2. 排序的元素对应的值是string， 那么sortType = "string";
// 3. 排序的元素对应的是是其他类型, 默认是不排序, (后面可以扩展)
//sortDire是排序的方向, 可以是asc或者desc, 默认是数据的原始方向(就是没有排序方向)
String sortItem = "Length";
String sortType = "int";
String sortDire = "desc";
Collections.sort(list, new SortComparator(sortItem, sortType, sortDire));
for (int i = 0; i < list.size(); i++) {
jsonObj = list.get(i);
sort_JsonArray.add(jsonObj);
}
System.out.println("after sort_JsonArray=" + sort_JsonArray.toString());
}
}
下面给出SortComparator.java
package testJava;
import java.util.Comparator;
import com.google.gson.JsonObject;
public class SortComparator implements Comparator<JsonObject> {
private String sortItem;
private String sortType;
private String sortDire;
public SortComparator(String sortItem, String sortType, String sortDire) {
this.sortItem = sortItem;
this.sortType = sortType;
this.sortDire = sortDire;
}
@Override
public int compare(JsonObject o1, JsonObject o2) {
String value1 = o1.getAsJsonObject().get(sortItem).getAsString();
String value2 = o2.getAsJsonObject().get(sortItem).getAsString();
if ("int".equalsIgnoreCase(this.sortType)) { // int sort
int int1 = Integer.parseInt(value1);
int int2 = Integer.parseInt(value2);
if ("asc".equalsIgnoreCase(this.sortDire)) {
return int1 - int2;
} else if ("desc".equalsIgnoreCase(this.sortDire)) {
return int2 - int1;
} else {
return 0;
}
} else if ("string".equalsIgnoreCase(this.sortType)) { // string sort
if ("asc".equalsIgnoreCase(this.sortDire)) {
return value1.compareTo(value2);
} else if ("desc".equalsIgnoreCase(this.sortDire)) {
return value2.compareTo(value1);
} else {
return 0;
}
} else { // nothing sort
return 0;
}
}
}
测试的结果:
jsonArray的初始值如下:
jsonArray = [
{"Name":"TVS","No":202,"Length":23},
{"Name":"TVC","No":203,"Length":14},
{"Name":"Wel","No":345,"Length":35},
{"Name":"Sma","No":678,"Length":45},
{"Name":"Sma","No":136,"Length":15},
{"Name":"Cus","No":257,"Length":17},
{"Name":"And","No":678,"Length":16},
{"Name":"Roo","No":136,"Length":56}
];
下面是按照Name元素从小到达排序: SortComparator("Name", "string", "asc")
after sort_JsonArray=[
{"Name":"And","No":678,"Length":16},
{"Name":"Cus","No":257,"Length":17},
{"Name":"Roo","No":136,"Length":56},
{"Name":"Sma","No":678,"Length":45},
{"Name":"Sma","No":136,"Length":15},
{"Name":"TVC","No":203,"Length":14},
{"Name":"TVS","No":202,"Length":23},
{"Name":"Wel","No":345,"Length":35}
]
下面是按照Name元素从大到小排序: SortComparator("Name", "string", "desc")
after sort_JsonArray=[
{"Name":"Wel","No":345,"Length":35},
{"Name":"TVS","No":202,"Length":23},
{"Name":"TVC","No":203,"Length":14},
{"Name":"Sma","No":678,"Length":45},
{"Name":"Sma","No":136,"Length":15},
{"Name":"Roo","No":136,"Length":56},
{"Name":"Cus","No":257,"Length":17},
{"Name":"And","No":678,"Length":16}
]
下面是按照Length元素从小到大排序: SortComparator("Length", "int", "asc")
after sort_JsonArray=[
{"Name":"TVC","No":203,"Length":14},
{"Name":"Sma","No":136,"Length":15},
{"Name":"And","No":678,"Length":16},
{"Name":"Cus","No":257,"Length":17},
{"Name":"TVS","No":202,"Length":23},
{"Name":"Wel","No":345,"Length":35},
{"Name":"Sma","No":678,"Length":45},
{"Name":"Roo","No":136,"Length":56}
]
下面是按照Length元素从大到小排序: SortComparator("Length", "int", "desc")
after sort_JsonArray=[
{"Name":"Roo","No":136,"Length":56},
{"Name":"Sma","No":678,"Length":45},
{"Name":"Wel","No":345,"Length":35},
{"Name":"TVS","No":202,"Length":23},
{"Name":"Cus","No":257,"Length":17},
{"Name":"And","No":678,"Length":16},
{"Name":"Sma","No":136,"Length":15},
{"Name":"TVC","No":203,"Length":14}
]
