基于jackson的json與對象互相轉換

項目中有對于json串的處理,剛好今天用到,分享給大家一個好用的架構 — jackson

需要的包 :

項目是maven管理的,給大家一個配置檔案的引用

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< dependency > < groupId >org.codehaus.jackson</ groupId > < artifactId >jackson-core-asl</ artifactId > < version >1.9.12</ version > </ dependency > < dependency > < groupId >org.codehaus.jackson</ groupId > < artifactId >jackson-mapper-asl</ artifactId > < version >1.9.12</ version > </ dependency >

測試代碼  :   

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import java.io.IOException; import java.util.HashMap; import org.codehaus.jackson.JsonParseException; import org.codehaus.jackson.map.JsonMappingException; import org.codehaus.jackson.map.ObjectMapper; import com.bny.bank.core.BusinessException; public class Test { @SuppressWarnings ( "rawtypes" ) public static void main(String[] args)  throws BusinessException, JsonParseException, JsonMappingException, IOException { ObjectMapper mapper =  new ObjectMapper(); String str =  "{\"jackson\":[{\"id\":\"1\",\"desc\":\"這是一個好工具\",\"sortId\":\"1\"},{\"id\":\"2\",\"desc\":\"這是一個好工具\",\"sortId\":\"2\"}]}" ; // readValue(json串, 要轉換的類型) HashMap m = mapper.readValue(str, HashMap. class ); System.out.println(m.toString()); // writeValueAsString(要轉換的類型),傳回一個json System.out.println(mapper.writeValueAsString(m)); } }

輸出結果  :