SpringMVC(使用IE执行AJAX时返回JSON出现下载文件/@ResponseBody出现乱码解决方法)

一、避免IE执行AJAX时,返回JSON出现下载文件

<!-- 避免IE执行AJAX时,返回JSON出现下载文件 -->
<bean id="mappingJacksonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<value>text/html;charset=UTF-8</value>
</list>
</property>
</bean>

<!-- 启动Spring MVC的注解功能，完成请求和注解POJO的映射 -->
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<ref bean="mappingJacksonHttpMessageConverter" /><!-- json转换器 -->
</list>
</property>
</bean>

 

 

二、使用@ResponseBody出现乱码解决方法 

1、 RequestMapping

@Controller
@RequestMapping(value = "/test")
public class TestController {

	@ResponseBody
	@RequestMapping(value = "/test", method = {RequestMethod.GET})
	public String test() {
		return "中文";
	}
}

 2、原因是org.springframework.http.converter.StringHttpMessageConverter类默认编码是IOS-8859-1 

 3、解决方法

   3.1、自己定义一个HttpMessageConverter<String>的实现类即可解决问题。 

public class UTF8StringHttpMessageConverter extends AbstractHttpMessageConverter<String> {

	public static final Charset DEFAULT_CHARSET = Charset.forName("UTF-8");

	private final List<Charset> availableCharsets;

	private boolean writeAcceptCharset = true;

	public UTF8StringHttpMessageConverter() {
		super(new MediaType("text", "plain", DEFAULT_CHARSET), MediaType.ALL);
		this.availableCharsets = new ArrayList<Charset>(Charset.availableCharsets().values());
	}

	public void setWriteAcceptCharset(boolean writeAcceptCharset) {
		this.writeAcceptCharset = writeAcceptCharset;
	}

	@Override
	public boolean supports(Class<?> clazz) {
		return String.class.equals(clazz);
	}

	@Override
	protected String readInternal(@SuppressWarnings("rawtypes") Class clazz, HttpInputMessage inputMessage) throws IOException {
		Charset charset = getContentTypeCharset(inputMessage.getHeaders().getContentType());
		return FileCopyUtils.copyToString(new InputStreamReader(inputMessage.getBody(), charset));
	}

	@Override
	protected Long getContentLength(String s, MediaType contentType) {
		Charset charset = getContentTypeCharset(contentType);
		try {
			return (long) s.getBytes(charset.name()).length;
		}
		catch (UnsupportedEncodingException ex) {
			throw new InternalError(ex.getMessage());
		}
	}

	@Override
	protected void writeInternal(String s, HttpOutputMessage outputMessage) throws IOException {
		if (writeAcceptCharset) {
			outputMessage.getHeaders().setAcceptCharset(getAcceptedCharsets());
		}
		Charset charset = getContentTypeCharset(outputMessage.getHeaders().getContentType());
		FileCopyUtils.copy(s, new OutputStreamWriter(outputMessage.getBody(), charset));
	}

	protected List<Charset> getAcceptedCharsets() {
		return this.availableCharsets;
	}

	private Charset getContentTypeCharset(MediaType contentType) {
		if (contentType != null && contentType.getCharSet() != null) {
			return contentType.getCharSet();
		}
		else {
			return DEFAULT_CHARSET;
		}
	}
}

 

<mvc:annotation-driven conversion-service="conversion-service" validator="validator">
	<mvc:message-converters register-defaults="false">
		<bean class="org.springframework.http.converter.ByteArrayHttpMessageConverter" />
		<bean class="org.springframework.http.converter.FormHttpMessageConverter" />
		<bean class="org.springframework.http.converter.xml.SourceHttpMessageConverter" />
		<bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />
		<bean class="my.pkg.UTF8StringHttpMessageConverter" />
	</mvc:message-converters>
</mvc:annotation-driven>

 3.2、设置StringHttpMessageConverter编码

<mvc:annotation-driven conversion-service="conversion-service" validator="validator">
		<mvc:message-converters>
			<bean class="org.springframework.http.converter.ByteArrayHttpMessageConverter" />
			<bean class="org.springframework.http.converter.FormHttpMessageConverter" />
			<bean class="org.springframework.http.converter.xml.SourceHttpMessageConverter" />
			<bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />
			<bean class="org.springframework.http.converter.StringHttpMessageConverter">
				<constructor-arg value="UTF-8" />
			</bean>
		</mvc:message-converters>
	</mvc:annotation-driven>