Jackson快速替换Fastjson之道
fastjson
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项目地址:https://gitcode.com/gh_mirrors/fastj/fastjson
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·
Jackson快速替换Fastjson之道
一· 概述
Fastjson已经连续几次爆出高危漏洞,和Structs一样,每次影响范围都比较广,殃及几乎所有的JAVA后台系统。为避免以后频繁地应急处理Fastjson的安全漏洞,痛定思痛,决定放弃Fastjson转投jackson的怀抱了。
二· 快速替换
2.1 加入依赖
在pom文件中添加jackson的依赖包,如下:
<properties>
<jackson-version>2.9.9</jackson-version>
</properties>
...
<dependencyManagement>
<dependencies>
<!--jackson-->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>${jackson-version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>${jackson-version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>${jackson-version}</version>
</dependency>
...
2.2 适配接口
在FastJson中序列化和发序列化用的最多的两个函数就是toJSONString
和toJavaObject
,部分场景也会用到数据组的序列化相关函数,以及利用json进行复制对象(类似Cloneable),因此,我们需要适配基本所需的功能,以下的接口基本能涵盖大部分的场景。
public static String toJSONString(Object obj);
public static String toJSONString(Object obj, Supplier<String> defaultSupplier);
public static <T> T toJavaObject(String value, Class<T> tClass);
public static <T> T toJavaObject(Object obj, Class<T> tClass);
public static <T> T toJavaObject(String value, Class<T> tClass, Supplier<T> defaultSupplier)
public static <T> T jsonCopy(Object obj, Class<T> tClass)
数组相关的接口定义如下:
public static List<Object> toList(String value);
public static List<Object> toList(Object value);
public static List<Object> toList(String value, Supplier<List<Object>> defaultSuppler);
public static List<Object> toList(Object value, Supplier<List<Object>> defaultSuppler);
public static <T> List<T> toJavaObjectList(String value, Class<T> tClass)
public static <T> List<T> toJavaObjectList(Object obj, Class<T> tClass)
public static <T> List<T> toJavaObjectList(String value, Class<T> tClass, Supplier<List<T>> defaultSupplier)
2.3 适配JsonObject
如果变量定义为JsonObject类型,可以将其修改为Map
public static Map<String, Object> toMap(String value);
public static Map<String, Object> toMap(Object value);
public static Map<String, Object> toMap(Object value, Supplier<Map<String, Object>> defaultSupplier);
public static Map<String, Object> toMap(String value, Supplier<Map<String, Object>> defaultSupplier);
三· 工具类封装代码
为了统一替换fastjson,我封装了一个Java(要求JDK8+)工具类JsonUtils,方便大家扩展。
package com.netease.nis.nhids2.base.util;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.collections.MapUtils;
import org.apache.commons.lang3.StringUtils;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.function.Supplier;
/**
* @Description: http://www.easysb.cn/2019/07/482.html
* @Date: 2019/7/16
* @Author: Jekkay Hu
*/
@Slf4j
public class JsonUtils {
// 加载速度太慢了,放在静态代码块中
// private static final ObjectMapper mapper = new ObjectMapper();
private static ObjectMapper mapper;
/**
* 设置一些通用的属性
*/
static {
mapper = new ObjectMapper();
// 如果json中有新增的字段并且是实体类类中不存在的,不报错
// mapper.configure(DeserializationFeature.FAIL_ON_IGNORED_PROPERTIES, false);
// 如果存在未知属性,则忽略不报错
mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
// 允许key没有双引号
mapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
// 允许key有单引号
mapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
// 允许整数以0开头
mapper.configure(JsonParser.Feature.ALLOW_NUMERIC_LEADING_ZEROS, true);
// 允许字符串中存在回车换行控制符
mapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_CONTROL_CHARS, true);
}
public static String toJSONString(Object obj) {
return obj != null ? toJSONString(obj, () -> "", false) : "";
}
public static String toFormatJSONString(Object obj) {
return obj != null ? toJSONString(obj, () -> "", true) : "";
}
public static String toJSONString(Object obj, Supplier<String> defaultSupplier, boolean format) {
try {
if (obj == null) {
return defaultSupplier.get();
}
if (obj instanceof String) {
return obj.toString();
}
if (obj instanceof Number) {
return obj.toString();
}
if (format) {
return mapper.writerWithDefaultPrettyPrinter().writeValueAsString(obj);
}
return mapper.writeValueAsString(obj);
} catch (Throwable e) {
log.error(String.format("toJSONString %s", obj != null ? obj.toString() : "null"), e);
}
return defaultSupplier.get();
}
public static <T> T toJavaObject(String value, Class<T> tClass) {
return StringUtils.isNotBlank(value) ? toJavaObject(value, tClass, () -> null) : null;
}
public static <T> T toJavaObject(Object obj, Class<T> tClass) {
return obj != null ? toJavaObject(toJSONString(obj), tClass, () -> null) : null;
}
public static <T> T toJavaObject(String value, Class<T> tClass, Supplier<T> defaultSupplier) {
try {
if (StringUtils.isBlank(value)) {
return defaultSupplier.get();
}
return mapper.readValue(value, tClass);
} catch (Throwable e) {
log.error(String.format("toJavaObject exception: \n %s\n %s", value, tClass), e);
}
return defaultSupplier.get();
}
public static <T> List<T> toJavaObjectList(String value, Class<T> tClass) {
return StringUtils.isNotBlank(value) ? toJavaObjectList(value, tClass, () -> null) : null;
}
public static <T> List<T> toJavaObjectList(Object obj, Class<T> tClass) {
return obj != null ? toJavaObjectList(toJSONString(obj), tClass, () -> null) : null;
}
public static <T> List<T> toJavaObjectList(String value, Class<T> tClass, Supplier<List<T>> defaultSupplier) {
try {
if (StringUtils.isBlank(value)) {
return defaultSupplier.get();
}
JavaType javaType = mapper.getTypeFactory().constructParametricType(List.class, tClass);
return mapper.readValue(value, javaType);
} catch (Throwable e) {
log.error(String.format("toJavaObjectList exception \n%s\n%s", value, tClass), e);
}
return defaultSupplier.get();
}
// 简单地直接用json复制或者转换(Cloneable)
public static <T> T jsonCopy(Object obj, Class<T> tClass) {
return obj != null ? toJavaObject(toJSONString(obj), tClass) : null;
}
public static Map<String, Object> toMap(String value) {
return StringUtils.isNotBlank(value) ? toMap(value, () -> null) : null;
}
public static Map<String, Object> toMap(Object value) {
return value != null ? toMap(value, () -> null) : null;
}
public static Map<String, Object> toMap(Object value, Supplier<Map<String, Object>> defaultSupplier) {
if (value == null) {
return defaultSupplier.get();
}
try {
if (value instanceof Map) {
return (Map<String, Object>) value;
}
} catch (Exception e) {
log.info("fail to convert" + toJSONString(value), e);
}
return toMap(toJSONString(value), defaultSupplier);
}
public static Map<String, Object> toMap(String value, Supplier<Map<String, Object>> defaultSupplier) {
if (StringUtils.isBlank(value)) {
return defaultSupplier.get();
}
try {
return toJavaObject(value, LinkedHashMap.class);
} catch (Exception e) {
log.error(String.format("toMap exception\n%s", value), e);
}
return defaultSupplier.get();
}
public static List<Object> toList(String value) {
return StringUtils.isNotBlank(value) ? toList(value, () -> null) : null;
}
public static List<Object> toList(Object value) {
return value != null ? toList(value, () -> null) : null;
}
public static List<Object> toList(String value, Supplier<List<Object>> defaultSuppler) {
if (StringUtils.isBlank(value)) {
return defaultSuppler.get();
}
try {
return toJavaObject(value, List.class);
} catch (Exception e) {
log.error("toList exception\n" + value, e);
}
return defaultSuppler.get();
}
public static List<Object> toList(Object value, Supplier<List<Object>> defaultSuppler) {
if (value == null) {
return defaultSuppler.get();
}
if (value instanceof List) {
return (List<Object>) value;
}
return toList(toJSONString(value), defaultSuppler);
}
public static long getLong(Map<String, Object> map, String key) {
if (MapUtils.isEmpty(map)) {
return 0L;
}
String valueStr = String.valueOf(map.get(key));
if (StringUtils.isBlank(valueStr) || !StringUtils.isNumeric(valueStr)) {
return 0L;
}
return Long.valueOf(valueStr);
}
public static int getInt(Map<String, Object> map, String key) {
if (MapUtils.isEmpty(map)) {
return 0;
}
String valueStr = String.valueOf(map.get(key));
if (StringUtils.isBlank(valueStr) || !StringUtils.isNumeric(valueStr)) {
return 0;
}
return Integer.valueOf(valueStr);
}
}
博客地址: http://www.easysb.cn/2019/07/482.html
四· 小结
替换Fastjson的工作量可能比较大,影响的文件数量会比较多,大家一定要多多测试。为了避免以后经常应急Fastjson安全事件和保护系统安全,这些工作还是值得的。
GitHub 加速计划 / fastj / fastjson
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FASTJSON 2.0.x has been released, faster and more secure, recommend you upgrade.
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