春季-使用UTF-8从文件加载

Question

我在使用Spring加载UTF-8文件时遇到问题。

这就是对我有用的东西：

我有属性文件，使用此内容另存为UTF-8

global.variable.try=This is product variable
cache.location.filename.regions=regions
hacky.carky=éíáščýéíšž hehe haha hoho +íšářá

在控制器中，我有两种访问方式

@Controller
@RequestMapping(value = "/aserver")
public class AServerController {

@Value("${hacky.carky}")
    private String hackyCarky;  

    @RequestMapping(value = "/hackycarky", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
    @ResponseBody
    public Object hackycarky(ServletRequest servletRequest, ServletResponse response) throws MalformedURLException, IOException{
        return hackyCarky;
    }   

    @RequestMapping(value = "/regions", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
    @ResponseBody
    public Object regions(ServletRequest servletRequest, ServletResponse response) throws MalformedURLException, IOException{
        String filePath = "c:\\prace\\eclipse workspace\\czechtraditions\\server\\src\\main\\resources\\server-general.properties";
        return new String(Files.readAllBytes(Paths.get(filePath)), StandardCharsets.UTF_8);     
    }   
}

如果我访问/ aserver / hackycarky，它会提供所需的输出：

éíáščýéíšž hehe haha hoho +íšářá

但是，如果我访问/ aserver / regions，则输出如下：

global.variable.try=This is product variable
cache.location.filename.regions=regions
hacky.carky=���??���?? hehe haha hoho +�?�?�

PS：我不需要访问属性文件，这只是测试用例，可以肯定的是，该文件的格式正确-因此可以按预期使用@Value("${hacky.carky}")

两种情况下，响应标头都是相同的，都具有此属性

Content-Type:application/json;charset=UTF-8

我确实在web.xml中设置了utf-8的过滤器映射：

<filter>
    <filter-name>encoding-filter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
        <param-name>encoding</param-name>
        <param-value>UTF-8</param-value>
    </init-param>
    <init-param>
        <param-name>forceEncoding</param-name>
        <param-value>true</param-value>
    </init-param>
</filter>

<filter-mapping>
    <filter-name>encoding-filter</filter-name>
    <url-pattern>/rest/*</url-pattern>
</filter-mapping>

我在pom.xml中的maven中确实有utf-8设置：

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

完整地址的示例是http://localhost:8080/czechtraditions-server/rest/aserver/regions

Answer 1

解决了。

我不将文件转换为String，而是发送字节数组，让客户端决定（基于标头中的content-type）如何处理它，并且效果很好。

@RequestMapping(value = "/regions", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
@ResponseBody
public Object regions(ServletRequest servletRequest, ServletResponse response) throws MalformedURLException, IOException{
    String filePath = "c:\\prace\\eclipse workspace\\czechtraditions\\server\\src\\main\\resources\\server-general.properties";
    return Files.readAllBytes(Paths.get(filePath));     
}