用正则表达式替换部分字符串

Question

{"key1":"value1","key2":"{\"key2_1\":\"123\",\"key2_2\":\"456\",\"key2_3\":\"33333\"}"}

{
    "key1": "value1",
    "key2": "{\"key2_1\":\"123\",\"key2_2\":\"456\",\"key2_3\":\"33333\"}"
}

我想使用Gson将字符串转换为Foo对象：

class Foo {
    private String key1;
    private Bar key2;
    ...
}

class Bar {
    private String key2_1;
    private String key2_2;
    private String key2_3;
    ...
}

下面是我的正则表达式：

String regexp = "\\{[\"a-zA-Z-0-9:,\\\\]*\"key2\":\"\\{\\\\\"key2_1\\\\\":\\\\\"[a-zA-Z0-9]*\\\\\",\\\\\"key2_2\\\\\":\\\\\"[a-zA-Z0-9]*\\\\\",\\\\\"key2_3\\\\\":\\\\\"[a-zA-Z0-9]*\\\\\"\\}\"\\}[\"a-zA-Z-0-9:,\\\\]*";
Pattern pattern = Pattern.compile(regexp);
Matcher matcher = pattern.matcher(text);
if(matcher.matches()) {
    ... // TODO: Replace all "{, \" and }" but How???
}

如何使用此正则表达式将所有“{，\”.和“}替换为{，”，}而不更改JSON中的键和值？

Answer 1

黄金法则是不要使用正则表达式来处理这些事情：）我的建议是太依赖JSON映射器了，例如Jackson

你需要做的就是：

>

修复JSON在您的示例中，嵌套{

不需要双引号

添加Jackson依赖项

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>${jackson.version}</version>
</dependency>

ObjectMapper mapper = new ObjectMapper();
Foo foo = mapper.readValue( "{\"key1\":\"value1\",\"key2\":"
     + " {\"key2_1\":\"123\",\"key2_2\":\"456\",\"key2_3\":\"33333\"}}", Foo.class);
System.out.println(foo.toString());