java 如何在Struts2中返回HTTP错误状态码*和*内容
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How to return HTTP error status code *and* content in Struts2
提问by NobodyMan
I have a Controller that receives accepts http file uploads and responds with a JSON confirmation. If there is is any sort of problem with the procsessing of the upload I want to return an HTTP error status code (e.g. 403 for malformed requests or 500 for a general processing error), but I also want to send a JSON list of detailed error messages. I know how to return a 500 error (thanks to this post) but I don't know how to return the 500 code and still send content.
我有一个控制器，它接收接受 http 文件上传并以 JSON 确认响应。如果上传处理有任何问题，我想返回一个 HTTP 错误状态代码（例如 403 表示格式错误的请求或 500 表示一般处理错误），但我也想发送详细错误的 JSON 列表消息。我知道如何返回 500 错误（感谢这篇文章），但我不知道如何返回 500 代码并仍然发送内容。
Here's a snippit of my code (which doesn't do what I want it to):
这是我的代码的一个片段（它没有做我想要的）：
@Action(value = "upload", results = {
@Result(name = SUCCESS, type = "freemarker", location = "results.ftl", params = { "contentType", "text/plain" }),
@Result(name = ERROR, type = "freemarker", location = "error.ftl", params = { "contentType", "text/plain" }),
@Result(name = ERROR, type = "httpheader", params = { "status", "500" })
})
public String upload() {
//do stuff
if(CollectionUtils.isEmpty(getActionErrors()) {
return SUCCESS;
} else {
return ERROR;
}
}
采纳答案by Ty Danielson
This is an old post, but if you are using the Struts-JSON which I suggest using you can simply return an error object with what you want and attach the status code like below:
这是一篇旧帖子，但如果您使用的是我建议使用的 Struts-JSON，您可以简单地返回一个带有您想要的错误对象并附加如下状态代码：
@Result(name = ERROR, type="json",
params = {"root","errorResponse", "statusCode", "500"}
)
回答by NobodyMan
Update 2/24/15: ty-danielson's answeris the correct one. It applies to JSON responses, which is what I wanted even though I was using freemarker templates to generate them (another bad idea).
2015 年 2 月 24 日更新：ty-danielson 的答案是正确的。它适用于 JSON 响应，这是我想要的，即使我使用 freemarker 模板来生成它们（另一个坏主意）。
If you really want a freemarker template with error status code:My original answer is stillthe wrong approach because it's bad form to access the ServletResponse from inside an action method. Struts' built-in FreemarkerResult does not accept a status code parameter, but you can easily add this functionality by subclassing it (example taken from GBIF project)
如果你真的想要一个带有错误状态代码的 freemarker 模板：我原来的答案仍然是错误的方法，因为从操作方法内部访问 ServletResponse 是一种错误的形式。Struts 的内置 FreemarkerResult 不接受状态代码参数，但您可以通过对其进行子类化来轻松添加此功能（示例来自GBIF 项目）
/**
* Same as FreemarkerResult, but with added 'statusCode' parameter.
* (don't forget to register this result type in struts-config.xml)
*/
public class FreemarkerHttpResult extends FreemarkerResult {
private int status;
public int getStatusCode() {
return status;
}
public void setStatusCode(int status) {
this.status = status;
}
@Override
protected void postTemplateProcess(Template template, TemplateModel data) throws IOException {
super.postTemplateProcess(template, data);
if (status >= 100 && status < 600) {
HttpServletResponse response = ServletActionContext.getResponse();
response.setStatus(status);
}
}
}
Then declare your action mapping like so:
然后像这样声明你的动作映射：
@Action(value = "myAction", results = {
@Result(name = SUCCESS, type = "freemarker", location = "results.ftl"),
@Result(name = ERROR, type = "freemarkerhttp", location = "error.ftl", params = { "statusCode", "500"})
})
public String myAction() {
//do stuff, then return SUCCESS or ERROR
}
My Original Answer
我的原答案
So, I'm not sure if this is "proper" from a struts2 perspective, but here's a solution that acomplishes my goal of returning the http error code while still being able to render a freemarker template. I'll mark this as the answer until a better one comes along.
所以，我不确定从 struts2 的角度来看这是否“正确”，但这里有一个解决方案，它实现了我返回 http 错误代码的目标，同时仍然能够呈现 freemarker 模板。我会将此标记为答案，直到出现更好的答案。
@Action(value = "upload", results = {
@Result(name = SUCCESS, type = "freemarker", location = "results.ftl", params = { "contentType", "text/plain"}),
@Result(name = ERROR, type = "freemarker", location = "error.ftl", params = { "contentType", "text/plain"})
})
public String upload() {
try {
//do stuff
} Catch(SomeExceptionType ex) {
addActionError("you did something bad");
HttpServletResponse response = ServletActionContext.getResponse();
response.setStatus(400);
}
}
回答by Vlad C?lin Buzea
In case someone is looking for the struts.xmlversion of the accepted answer, I'm going to leave it here:
如果有人正在寻找已接受答案的struts.xml版本，我将把它留在这里：
<action name="upload"
class="...">
<exception-mapping exception="java.lang.Exception" result="error"/>
<result name="error" type="json">
<param name="statusCode">418</param>
</result>
<result name="Success" type="json" />
</action>
回答by Jeremy
I don't have time to setup a test Struts2 application, but maybe have a single error result:
我没有时间设置测试 Struts2 应用程序，但可能只有一个错误结果：
@Result(name = ERROR, type = "freemarker", location = "error.ftl",
params = { "contentType", "text/plain", "status", "500" })
