Question

我有一个arraylist，如：

List skus = new ArrayList();

，输出

[{value=4, sequence=1, availableinventory=50, defining=size, skuid=24846457, partnumber=602016000967318}, 
 {value=6, sequence=2, availableinventory=50, defining=size, skuid=24846459, partnumber=602016000967319}, 
 {value=8, sequence=3, availableinventory=50, defining=size, skuid=24846462, partnumber=602016000967320}, 
 {value=10, sequence=4, availableinventory=50, defining=size, skuid=24846468, partnumber=602016000967321}, 
 {value=12, sequence=5, availableinventory=50, defining=size, skuid=24846476, partnumber=602016000967322}, 
 {value=14, sequence=6, availableinventory=50, defining=size, skuid=24846484, partnumber=602016000967323}, 
 {value=16, sequence=7, availableinventory=50, defining=size, skuid=24846492, partnumber=602016000967324}]

但我想将上面的arraylist转换为JSON响应，这是一个字符串生成器，如下所示。

StringBuilder jsonUIRespesponse = new StringBuilder();

[{"skuid":"24845337","value":"16","partnumber":"602016000967240","availableinventory":"50","sequence":"7","defining":"size"},
{"skuid":"24845325","value":"6","partnumber":"602016000967235","availableinventory":"50","sequence":"2","defining":"size"},
{"skuid":"24845326","value":"8","partnumber":"602016000967236","availableinventory":"50","sequence":"3","defining":"size"},
{"skuid":"24845327","value":"10","partnumber":"602016000967237","availableinventory":"50","sequence":"4","defining":"size"},
{"skuid":"24845328","value":"12","partnumber":"602016000967238","availableinventory":"50","sequence":"5","defining":"size"},
{"skuid":"24845329","value":"14","partnumber":"602016000967239","availableinventory":"50","sequence":"6","defining":"size"},
{"skuid":"24845324","value":"4","partnumber":"602016000967234","availableinventory":"50","sequence":"1","defining":"size"}]

Answer 1

使用从Java对象转换为JSON结构的映射器，您可以非常轻松地完成此操作。我使用杰克逊，但还有其他实现。

首先确保您的Java项目中有Jackson库。如果您正在使用Maven，则必须添加依赖项。需要说明的是，JDK中不存在AFAIK常见的Json序列化器/反序列化器，因此您必须在项目中添加库，即JSR 353的参考实现：JSON Processing的Java API

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.3.3</version>
</dependency>

然后，您可以使用ObjectMapper实用程序类转换Json中的Java对象。

import com.fasterxml.jackson.databind.ObjectMapper;
...
ObjectMapper mapper = new ObjectMapper();
String jsonResponse = mapper.writeValueAsString(skus);

或附加到StringBuilder

StringBuilder sb = new StringBuilder();
sb.append(mapper.writeValueAsString(skus));

Answer 2

您可以使用杰克逊图书馆。

  ObjectMapper OBJECT_MAPPER    = new ObjectMapper();

StringWriter stringWriter = new StringWriter();
     OBJECT_MAPPER.writeValue(stringWriter, YOUR_LIST);
    return stringWriter.toString();

Arraylist到JSON字符串构建器

2 个答案: