package com.example.erp.tools;
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import com.fasterxml.jackson.core.JacksonException;
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import com.fasterxml.jackson.core.type.TypeReference;
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import com.fasterxml.jackson.databind.JavaType;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
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import org.springframework.boot.json.JsonParseException;
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import java.util.List;
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import java.util.concurrent.Callable;
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// 将繁琐的异常处理进行了解决
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public class JacksonUtil {
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/**
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* 工具类不需要创建实例对象
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*/
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private JacksonUtil(){
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}
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/**
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* 给ObjectMapper进行单例模式，由于ObjectMapper 是线程安全的，可以复用，放置重复创建影响性能
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*/
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private static final ObjectMapper objectMapper;
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static {
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objectMapper = new ObjectMapper();
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objectMapper.registerModule(new JavaTimeModule());
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}
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public static ObjectMapper getObjectMapper(){
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return objectMapper;
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}
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public static final <T> T tryParse(Callable<T> parser) {
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return JacksonUtil.tryParse(parser, JacksonException.class);
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}
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public static final <T> T tryParse(Callable<T> parser, Class<? extends Exception> check) {
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try {
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return parser.call();
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}
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catch (Exception ex) {
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if (check.isAssignableFrom(ex.getClass())) {
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throw new JsonParseException(ex);
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}
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throw new IllegalStateException(ex);
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}
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}
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// 普通对象和List对象共同使用
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public static String writeValueAsString(Object object){
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return JacksonUtil.tryParse(()->{
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return JacksonUtil.getObjectMapper().writeValueAsString(object);
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});
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}
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// 普通对象的反序列化
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public static <T> T readValue(String str,Class<T> valueType){
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return JacksonUtil.tryParse(()->{
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return JacksonUtil.getObjectMapper().readValue(str,valueType);
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});
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}
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public static <T> T readValueObjectToString(Object object,TypeReference<T> valueType){
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String str = JacksonUtil.tryParse(()->{
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return JacksonUtil.getObjectMapper().writeValueAsString(object);
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});
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return JacksonUtil.tryParse(()->{
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return JacksonUtil.getObjectMapper().readValue(str,valueType);
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});
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}
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// List类型的反序列化
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public static <T> T readListValue(String str,Class<?> valueType){
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JavaType javaType = JacksonUtil.getObjectMapper().getTypeFactory().constructParametricType(List.class,valueType);
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return JacksonUtil.tryParse(()->{
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return JacksonUtil.getObjectMapper().readValue(str,javaType);
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});
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}
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}
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