TA貢獻(xiàn)1155條經(jīng)驗(yàn) 獲得超0個(gè)贊
嗯，你也可以用杰克遜實(shí)現(xiàn)這一點(diǎn)。（因?yàn)槟憧紤]使用杰克遜，它似乎更舒服）。
使用ObjectMapper的convertValue方法：
final ObjectMapper mapper = new ObjectMapper(); // jackson's objectmapper
final MyPojo pojo = mapper.convertValue(map, MyPojo.class);
無(wú)需轉(zhuǎn)換為JSON字符串或其他內(nèi)容; 直接轉(zhuǎn)換的速度要快得多。
TA貢獻(xiàn)2011條經(jīng)驗(yàn) 獲得超2個(gè)贊
Gson的解決方案：
Gson gson = new Gson();
JsonElement jsonElement = gson.toJsonTree(map);
MyPojo pojo = gson.fromJson(jsonElement, MyPojo.class);
TA貢獻(xiàn)1785條經(jīng)驗(yàn) 獲得超4個(gè)贊
我測(cè)試了Jackson和BeanUtils，發(fā)現(xiàn)BeanUtils要快得多。
在我的機(jī)器（Windows8.1，JDK1.7）中，我得到了這個(gè)結(jié)果。
BeanUtils t2-t1 = 286
Jackson t2-t1 = 2203
public class MainMapToPOJO {
public static final int LOOP_MAX_COUNT = 1000;
public static void main(String[] args) {
Map<String, Object> map = new HashMap<>();
map.put("success", true);
map.put("data", "testString");
runBeanUtilsPopulate(map);
runJacksonMapper(map);
}
private static void runBeanUtilsPopulate(Map<String, Object> map) {
long t1 = System.currentTimeMillis();
for (int i = 0; i < LOOP_MAX_COUNT; i++) {
try {
TestClass bean = new TestClass();
BeanUtils.populate(bean, map);
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
}
long t2 = System.currentTimeMillis();
System.out.println("BeanUtils t2-t1 = " + String.valueOf(t2 - t1));
}
private static void runJacksonMapper(Map<String, Object> map) {
long t1 = System.currentTimeMillis();
for (int i = 0; i < LOOP_MAX_COUNT; i++) {
ObjectMapper mapper = new ObjectMapper();
TestClass testClass = mapper.convertValue(map, TestClass.class);
}
long t2 = System.currentTimeMillis();
System.out.println("Jackson t2-t1 = " + String.valueOf(t2 - t1));
}}
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