package org.linlinjava.litemall.core.util;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.io.IOException;
import java.util.List;
import java.util.Map;
public class JacksonUtil {
private static final Log logger = LogFactory.getLog(JacksonUtil.class);
public static String parseString(String body, String field) {
ObjectMapper mapper = new ObjectMapper();
JsonNode node;
try {
node = mapper.readTree(body);
JsonNode leaf = node.get(field);
if (leaf != null) {
return leaf.asText();
}
} catch (IOException e) {
logger.error(e.getMessage(), e);
}
return null;
}
public static List<String> parseStringList(String body, String field) {
ObjectMapper mapper = new ObjectMapper();
JsonNode node;
try {
node = mapper.readTree(body);
JsonNode leaf = node.get(field);
if (leaf != null)
return mapper.convertValue(leaf, new TypeReference<List<String>>() {
});
} catch (IOException e) {
logger.error(e.getMessage(), e);
}
return null;
}
public static Integer parseInteger(String body, String field) {
ObjectMapper mapper = new ObjectMapper();
JsonNode node;
try {
node = mapper.readTree(body);
JsonNode leaf = node.get(field);
if (leaf != null)
return leaf.asInt();
} catch (IOException e) {
logger.error(e.getMessage(), e);
}
return null;
}
public static List<Integer> parseIntegerList(String body, String field) {
ObjectMapper mapper = new ObjectMapper();
JsonNode node;
try {
node = mapper.readTree(body);
JsonNode leaf = node.get(field);
if (leaf != null)
return mapper.convertValue(leaf, new TypeReference<List<Integer>>() {
});
} catch (IOException e) {
logger.error(e.getMessage(), e);
}
return null;
}
public static Boolean parseBoolean(String body, String field) {
ObjectMapper mapper = new ObjectMapper();
JsonNode node;
try {
node = mapper.readTree(body);
JsonNode leaf = node.get(field);
if (leaf != null)
return leaf.asBoolean();
} catch (IOException e) {
logger.error(e.getMessage(), e);
}
return null;
}
public static Short parseShort(String body, String field) {
ObjectMapper mapper = new ObjectMapper();
JsonNode node;
try {
node = mapper.readTree(body);
JsonNode leaf = node.get(field);
if (leaf != null) {
Integer value = leaf.asInt();
return value.shortValue();
}
} catch (IOException e) {
logger.error(e.getMessage(), e);
}
return null;
}
public static Byte parseByte(String body, String field) {
ObjectMapper mapper = new ObjectMapper();
JsonNode node;
try {
node = mapper.readTree(body);
JsonNode leaf = node.get(field);
if (leaf != null) {
Integer value = leaf.asInt();
return value.byteValue();
}
} catch (IOException e) {
logger.error(e.getMessage(), e);
}
return null;
}
public static <T> T parseObject(String body, String field, Class<T> clazz) {
ObjectMapper mapper = new ObjectMapper();
JsonNode node;
try {
node = mapper.readTree(body);
node = node.get(field);
return mapper.treeToValue(node, clazz);
} catch (IOException e) {
logger.error(e.getMessage(), e);
}
return null;
}
public static Object toNode(String json) {
if (json == null) {
return null;
}
ObjectMapper mapper = new ObjectMapper();
try {
return mapper.readTree(json);
} catch (IOException e) {
logger.error(e.getMessage(), e);
}
return null;
}
public static Map<String, String> toMap(String data) {
ObjectMapper objectMapper = new ObjectMapper();
try {
return objectMapper.readValue(data, new TypeReference<Map<String, String>>() {
});
} catch (IOException e) {
logger.error(e.getMessage(), e);
}
return null;
}
public static String toJson(Object data) {
ObjectMapper objectMapper = new ObjectMapper();
try {
return objectMapper.writeValueAsString(data);
} catch (JsonProcessingException e) {
e.printStackTrace();
}
return null;
}
}package org.linlinjava.litemall.core.util;import com.fasterxml.jackson.core.JsonProcessingException;import com.fasterxml.jackson.core.type.TypeReference;import com.fasterxml.jackson.databind.JsonNode;import com.fasterxml.jackson.databind.ObjectMapper;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import java.io.IOException;import java.util.List;import java.util.Map;public class JacksonUtil { private static final Log logger = LogFactory.getLog(JacksonUtil.class); public static String parseString(String body, String field) { ObjectMapper mapper = new ObjectMapper(); JsonNode node; try { node = mapper.readTree(body); JsonNode leaf = node.get(field); if (leaf != null) { return leaf.asText(); } } catch (IOException e) { logger.error(e.getMessage(), e); } return null; } public static List<String> parseStringList(String body, String field) { ObjectMapper mapper = new ObjectMapper(); JsonNode node; try { node = mapper.readTree(body); JsonNode leaf = node.get(field); if (leaf != null) return mapper.convertValue(leaf, new TypeReference<List<String>>() { }); } catch (IOException e) { logger.error(e.getMessage(), e); } return null; } public static Integer parseInteger(String body, String field) { ObjectMapper mapper = new ObjectMapper(); JsonNode node; try { node = mapper.readTree(body); JsonNode leaf = node.get(field); if (leaf != null) return leaf.asInt(); } catch (IOException e) { logger.error(e.getMessage(), e); } return null; } public static List<Integer> parseIntegerList(String body, String field) { ObjectMapper mapper = new ObjectMapper(); JsonNode node; try { node = mapper.readTree(body); JsonNode leaf = node.get(field); if (leaf != null) return mapper.convertValue(leaf, new TypeReference<List<Integer>>() { }); } catch (IOException e) { logger.error(e.getMessage(), e); } return null; } public static Boolean parseBoolean(String body, String field) { ObjectMapper mapper = new ObjectMapper(); JsonNode node; try { node = mapper.readTree(body); JsonNode leaf = node.get(field); if (leaf != null) return leaf.asBoolean(); } catch (IOException e) { logger.error(e.getMessage(), e); } return null; } public static Short parseShort(String body, String field) { ObjectMapper mapper = new ObjectMapper(); JsonNode node; try { node = mapper.readTree(body); JsonNode leaf = node.get(field); if (leaf != null) { Integer value = leaf.asInt(); return value.shortValue(); } } catch (IOException e) { logger.error(e.getMessage(), e); } return null; } public static Byte parseByte(String body, String field) { ObjectMapper mapper = new ObjectMapper(); JsonNode node; try { node = mapper.readTree(body); JsonNode leaf = node.get(field); if (leaf != null) { Integer value = leaf.asInt(); return value.byteValue(); } } catch (IOException e) { logger.error(e.getMessage(), e); } return null; } public static <T> T parseObject(String body, String field, Class<T> clazz) { ObjectMapper mapper = new ObjectMapper(); JsonNode node; try { node = mapper.readTree(body); node = node.get(field); return mapper.treeToValue(node, clazz); } catch (IOException e) { logger.error(e.getMessage(), e); } return null; } public static Object toNode(String json) { if (json == null) { return null; } ObjectMapper mapper = new ObjectMapper(); try { return mapper.readTree(json); } catch (IOException e) { logger.error(e.getMessage(), e); } return null; } public static Map<String, String> toMap(String data) { ObjectMapper objectMapper = new ObjectMapper(); try { return objectMapper.readValue(data, new TypeReference<Map<String, String>>() { }); } catch (IOException e) { logger.error(e.getMessage(), e); } return null; } public static String toJson(Object data) { ObjectMapper objectMapper = new ObjectMapper(); try { return objectMapper.writeValueAsString(data); } catch (JsonProcessingException e) { e.printStackTrace(); } return null; }}翻译
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标签：node,mapper,return,leaf,工具,null,JacksonUtil,ObjectMapper From： https://www.cnblogs.com/chunwu822/p/17098298.html