package test;import cn.hutool.core.lang.Console;
import cn.jiguang.entity.ErrorMessage;
import com.alibaba.fastjson.JSON;
import com.dslplatform.json.DslJson;
import com.dslplatform.json.JsonReader;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.jsoniter.JsonIterator;
import com.jsoniter.ValueType;
import org.junit.Before;
import org.junit.Test;
import org.springframework.util.Assert;import java.io.*;
import java.util.Map;
import java.util.concurrent.atomic.AtomicReference;/*** @desc: dsl-json  fastjson  jackson  jsoniter 效率比较* @author: zengxc* @date: 2018/4/4*/
public class JSONTest {private static final ObjectMapper MAPPER = new ObjectMapper();public static String[] factors = {};private static String JSON_STR = null;private static int count = 0;private final DslJson<Object> dslJson = new DslJson<Object>();@Testpublic void testJsoniter2() throws IOException {JsonIterator jsonIterator = JsonIterator.parse("[123,{'id':20, 'errorMsg':'this error'},456]".replace('\'', '"'));AtomicReference<ErrorMessage> errorMessage = new AtomicReference<>();jsonIterator.readAny().forEach(any -> {if (any.valueType() == ValueType.OBJECT) {errorMessage.set(any.as(ErrorMessage.class));}});Console.print(errorMessage.get());Assert.isTrue(true, "Not to false");}@Testpublic void testJsoniter() throws IOException {JsonIterator jsonIterator = JsonIterator.parse("{'id':10, 'errorMsg':'this error'}".replace('\'', '"'));ErrorMessage errorMessage = jsonIterator.read(ErrorMessage.class);Assert.notNull(errorMessage, "can't be empty ");}@Testpublic void testFor() throws IOException {File file = new File("out.txt");file.mkdirs();PrintWriter printWriter = new PrintWriter(file);StringBuffer buffer = new StringBuffer();buffer.append("{");for (int i = 0; i < 1000000; i++) {if (i == 999999) {buffer.append("\"k" + i + "\":" + "\"v" + i + "\"" + "}");break;}buffer.append("\"k" + i + "\":" + "\"v" + i + "\"" + ",");}printWriter.println(buffer.toString());printWriter.flush();}@Beforepublic void init() throws Exception {FileReader fis = new FileReader(new File("D:\\WorkSpace\\springboot-helloworld\\out.txt"));BufferedReader br = new BufferedReader(fis);JSON_STR = br.readLine();}@Testpublic void testFastJson() {long startTime = System.currentTimeMillis();Map<String, String> map = JSON.parseObject(JSON_STR, Map.class);map.forEach((k, v) -> {count++;});System.out.println(System.currentTimeMillis() - startTime);System.out.println(count);}@Testpublic void testJsoniter03() throws IOException {long startTime = System.currentTimeMillis();JsonIterator jsonIterator = JsonIterator.parse(JSON_STR);Map<String, String> map = jsonIterator.readAny().as(Map.class);map.forEach((k, v) -> {count++;});System.out.println(System.currentTimeMillis() - startTime);System.out.println(count);}@Testpublic void testJackson() throws IOException {long startTime = System.currentTimeMillis();Map<String, String> map = MAPPER.readValue(JSON_STR, Map.class);map.forEach((k, v) -> {count++;});System.out.println(System.currentTimeMillis() - startTime);System.out.println(count);}@Testpublic void testDslJson() throws IOException {long startTime = System.currentTimeMillis();final byte[] buff = JSON_STR.getBytes("UTF-8");JsonReader<Object> jsonReader = dslJson.newReader(buff);Map map = jsonReader.next(Map.class);map.forEach((k, v) -> {count++;});System.out.println(System.currentTimeMillis() - startTime);System.out.println(count);}
}

结论：

dslJson > jsonIter > fastJson > jackson