Java ObjectMapper 无法解析为类型
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ObjectMapper cannot be resolved to a type
提问by Jürgen K.
I have troubles getting JSON to work. ObjectMappercannot be resolved. Library is imported correctly.
我在使用 JSON 时遇到了麻烦。ObjectMapper无法解决。库已正确导入。
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import net.sf.json.JSONException;
import net.sf.json.util.*;
import com.fasterxml.Hymanson.*;
public class Json {
private static final String jsonFilePath = "C:\Users\Juergen\Desktop\filesForExamples\mapExample.json";
public static void objectToJSON(HashMap<String, Mat> map) {
//Map<String, Object> mapObject = new HashMap<String, Object>();
ObjectMapper mapper = new ObjectMapper();
try {
objectMapper.writeValue(new File(jsonFilePath), map);
} catch (IOException e) {
e.printStackTrace();
}
}
}
回答by Rohit Yadav
If you are using mavenproject then add the following in the POM.xml
如果您使用的是maven项目，则在POM.xml
<dependency>
<groupId>com.fasterxml.Hymanson.core</groupId>
<artifactId>Hymanson-databind</artifactId>
<version>2.1.2</version>
</dependency>
But if you are using a simple javaproject then you need to add the following jars in your class path:
但是如果你使用的是一个简单的 java项目，那么你需要在你的类路径中添加以下 jars：
Hymanson-core-2.1.X,
Hymanson-databind-2.1.X
回答by Vishwa Ratna
Add import com.fasterxml.Hymanson.databind.ObjectMapper;to your project.
添加import com.fasterxml.Hymanson.databind.ObjectMapper;到您的项目中。
