如何将JSON字符串转换为Map< String，String>与杰克逊JSON [英] How to convert a JSON string to a Map<String, String> with Jackson JSON

问题描述

我正在尝试做类似的事情，但它不起作用：

I'm trying to do something like this but it doesn't work:

Map<String, String> propertyMap = new HashMap<String, String>();

propertyMap = JacksonUtils.fromJSON(properties, Map.class);

但IDE说：

未选中分配映射到地图<字符串，字符串>

这样做的正确方法是什么？
我只使用Jackson，因为这是项目中已有的内容，是否有一种原生Java方式转换为JSON /从JSON转换？

What's the right way to do this? I'm only using Jackson because that's what is already available in the project, is there a native Java way of converting to/from JSON?

在PHP中我只想 json_decode（$ str）然后我会回来一个数组。我在这里需要基本相同的东西。

In PHP I would simply json_decode($str) and I'd get back an array. I need basically the same thing here.

推荐答案

我有以下代码：

public void testJackson() throws IOException {  
    ObjectMapper mapper = new ObjectMapper(); 
    File from = new File("albumnList.txt"); 
    TypeReference<HashMap<String,Object>> typeRef 
            = new TypeReference<HashMap<String,Object>>() {};

    HashMap<String,Object> o = mapper.readValue(from, typeRef); 
    System.out.println("Got " + o); 
}   

它正在读取文件，但是 mapper.readValue （）也将接受 InputStream ，你可以从字符串中获取 InputStream 使用以下内容：

It's reading from a file, but mapper.readValue() will also accept an InputStream and you can obtain an InputStream from a string by using the following:

new ByteArrayInputStream(astring.getBytes("UTF-8")); 

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