JSLT是一种完整的JSON查询和转换语言。git地址：https://github.com/schibsted/jslt
java中使用：
<dependency>
<groupId>com.schibsted.spt.data</groupId>
<artifactId>jslt</artifactId>
<version>0.1.11</version>
<scope>compile</scope>
</dependency>
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.schibsted.spt.data.jslt.Expression;
import com.schibsted.spt.data.jslt.Parser;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import java.io.IOException;
@Slf4j
public class JsltUtil {
/**
* 转换json字符串(忽略异常，当异常时返回null)
* @param jsltStr jslt表达式
* @param inputStr json字符串入参
* @return
*/
public static String jsonAdapt(String jsltStr, String inputStr) {
try {
return jsonAdapt(jsltStr, inputStr, true);
} catch (Exception e) {
e.printStackTrace();
log.error("jsonAdapt error jsltStr={},inputStr={}", jsltStr, inputStr, e);
}
return null;
}
/**
* 转换json字符串
* @param jsltStr jslt表达式
* @param inputStr json字符串入参
* @param ignoreException 是否忽略异常 如果为ture，出现异常后返回null
* @return
*/
public static String jsonAdapt(String jsltStr, String inputStr, boolean ignoreException) throws IOException {
if (StringUtils.isBlank(jsltStr) || StringUtils.isBlank(inputStr)) {
log.info("jsonAdapt param illegal");
return null;
}
try {
ObjectMapper mapper = new ObjectMapper();
JsonNode input = mapper.readTree(inputStr);
Expression jslt = Parser.compileString(jsltStr);
JsonNode output = jslt.apply(input);
return output.toString();
} catch (Exception e) {
log.error("jsonAdapt error jsltStr={},inputStr={}", jsltStr, inputStr, e);
if (!ignoreException) {
throw e;
}
}
return null;
}
}
// jslt表达式// crowd 根据age进行if判断输出人群{ "name":.name, "age":.age, "crowd":if(.age<18) "未成年" else if(.age<60) "成年人" else "老年人"}// 入参：{ "name":"nameTest", "age":10}// 结果：{ "name" : "nameTest", "age" : 10, "crowd" : "未成年"} |
// jslt表达式// * : . 匹配输入对象中的所有键，除了那些已经指定的，并将它们复制到输出对象中；如果有部分字段不想全拷贝使用 ：* - bar, baz, quux : .// 注意一点， * ： 这个语法必须在最后，否则会报错 子对象中，没效果 "extendMsg3":{*:.} 这个字段直接不输出(只有当对象名和入参的一样时，才能在嵌套中再用* ，eg："extendMsg":{*:.} 是生效的){"extendMsg1":.extendMsg,"extendMsg2":{"married2":.extendMsg.married},*:.}// 入参：{ "name":"nameTest", "age":10, "extendMsg":{"sex":"男","married":false,"education":"小学生"}}// 结果：{ "extendMsg1" : { "sex" : "男", "married" : false, "education" : "小学生" }, "extendMsg2" : { "married2" : false }, "name" : "nameTest", "age" : 10, "extendMsg" : { "sex" : "男", "married" : false, "education" : "小学生" }} |
// 展开// jslt表达式{"sex":.extendMsg.sex,"married":.extendMsg.married,* - extendMsg:.}// 入参：{ "name":"nameTest", "age":10, "extendMsg":{"sex":"男","married":false,"education":"小学生"}}// 结果：{ "sex" : "男", "married" : false, "name" : "nameTest", "age" : 10}// 缩进// jslt表达式{"name":.name,"age":.age,"extendMsg":{"sex":.sex,"married":.married,"education":.education}}// 入参：{ "name":"nameTest", "age":10, "sex":"男", "married":false, "education":"小学生"}// 结果：{ "name" : "nameTest", "age" : 10, "extendMsg" : { "sex" : "男", "married" : false, "education" : "小学生" }} |
/** 把集合全部转换 */// jslt表达式[for(.) {*:.}]// 入参：[ { "name":"nameTest", "age":10, "sex":"男", "married":false, "education":"小学生" }, { "name":"nameTest2", "age":102, "sex":"女", "married":true, "education":"女博士" }]// 结果：// 输出和入参相同/** 集合部分转换 */// jslt表达式[for(.) {"name":.name,"age":.age,"test":"testxxx"}]// 结果：[ { "name" : "nameTest", "age" : 10, "test" : "testxxx"}, { "name" : "nameTest2", "age" : 102, "test" : "testxxx"} ] |
/** 1.复杂组合=基础+集合 转换；2.haveNextPaga 举例变量计算 */// jslt表达式{"pageIndex":.pageNo,"pageSize":.pageSize,"total":.total,"haveNextPaga":if((.total - .pageNo * .pageSize) > 0) true else false,"data":[for(.) {*:.}]}// 入参：{ "pageNo":1, "pageSize":2, "total":100, "list":[ { "name":"nameTest", "age":10, "sex":"男", "married":false, "education":"小学生" }, { "name":"nameTest2", "age":102, "sex":"女", "married":true, "education":"女博士" } ]}// 结果：{ "pageIndex" : 1, "pageSize" : 2, "total" : 100, "haveNextPaga" : true, "data" : [ { "key" : "pageNo", "value" : 1 }, { "key" : "pageSize", "value" : 2 }, { "key" : "total", "value" : 100 }, { "key" : "list", "value" : [ { "name" : "nameTest", "age" : 10, "sex" : "男", "married" : false, "education" : "小学生" }, { "name" : "nameTest2", "age" : 102, "sex" : "女", "married" : true, "education" : "女博士" } ] } ]} |
// jslt表达式{"data1":.[0].name,"data2":.[0].age}// 入参：[ { "name":"nameTest", "age":10, "sex":"男", "married":false, "education":"小学生" }, { "name":"nameTest2", "age":102, "sex":"女", "married":true, "education":"女博士" }]// 结果：{ "data1" : "nameTest", "data2" : 10}
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原文：https://www.cnblogs.com/taocong/p/14202651.html