将ServletOutputStream读取到String

Question

我试图阅读FreemarkerView渲染的结果:

View view = viewResolver.resolveViewName(viewName, locale);
view.render(model, request, mockResponse);

要读取结果,我创建了mockResponse,它封装了HttpServletResponse:

public class HttpServletResponseEx extends HttpServletResponseWrapper {

    ServletOutputStream outputStream;

    public HttpServletResponseEx(HttpServletResponse response) throws IOException {
        super(response);
        outputStream = new ServletOutputStreamEx();
    }

    @Override
    public ServletOutputStream getOutputStream() {
        return outputStream;
    }

    @Override
    public PrintWriter getWriter() throws IOException {
        return new PrintWriter(new OutputStreamWriter(outputStream, "UTF-8"));
    }
}

还有我的ServletOutputStream,它使用StringBuilder构建String:

public class ServletOutputStreamEx extends ServletOutputStream {

    StringBuilder stringBuilder;

    public ServletOutputStreamEx() {
        this.stringBuilder = new StringBuilder();
    }

    @Override
    public void write(int b) throws IOException {
    } 

    @Override
    public void write(byte b[], int off, int len) throws IOException {
        stringBuilder.append(new String(b, "UTF-8"));
    }

    @Override
    public String toString() {
        return stringBuilder.toString();
    }
}

有了这些,我能够轻松地用方法阅读响应ServletOutputStreamEx.toString.

我的问题是write方法没有按正确的顺序调用,最后最终的String 混合而且顺序不正确.这可能是由Freemarker中的并发引起的,但我不知道如何修复它.

Answer 1

感谢您的答复：write(int b)未实施，因为它从未被调用。最后的问题是字节数​​组，它也包含了之前的字符串。因此需要将字符串创建为String(b, off, len, "UTF-8").