Question

如何在控制器中执行JSP并在Sring变量中获取html响应而不使用HtmlServletRequestWrapper

以下是我的代码，我试图点击jsp获取响应html str并将该html字符串传递给itext以生成pdf。

@RequestMapping(value = "/dosomething", method = RequestMethod.GET)
public void dosomething(HttpServletRequest request, HttpServletResponse response)  throws IOException {
    // setup your Cookie here
    response.setCookie(cookie)
    request.getRequestDispatcher("/WEB-INF/jsp/account_summary.jsp").include(request, response)

}

Answer 1

编辑：

我最终写了这个bean（使用HtmlServlet*Response*Wrapper :-)），我希望它对某人有用（感谢：Reading ServletOutputStream to String）

（viewResolver是自动装配的，因此需要在servlet上下文中定义）

import java.io.IOException;

import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.ui.Model;
import org.springframework.web.servlet.View;
import org.springframework.web.servlet.ViewResolver;

public class InternalRenderer {

    private final static String ENCODE = "UTF-8";

    @Autowired
    private ViewResolver viewResolver;

    public String evalView(HttpServletRequest request, HttpServletResponse response, Model model, Locale locale, String viewName) throws Exception {

        CustomHttpServletResponse customResponse = new CustomHttpServletResponse(response);

        View view = viewResolver.resolveViewName(viewName, locale);

        if(view != null){

            view.render(fillModelMap(model), request, customResponse);

            OutputStream os = customResponse.getOutputStream();

            return os.toString();

        }

        throw new Exception("no view found");
    }

    private Map<String, Object> fillModelMap(Model model) {

        if(model == null)
            return new HashMap<String,Object>();

        return model.asMap();
    }

    class CustomServletOutPutStream extends ServletOutputStream {

        private StringBuilder stringBuilder = new StringBuilder();

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

        @Override
        public void write(int b) {
            stringBuilder.append(b);
        }

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

    class CustomHttpServletResponse extends HttpServletResponseWrapper {

        private ServletOutputStream outputStream;
        private PrintWriter printWriter;

        public CustomHttpServletResponse(HttpServletResponse response) throws UnsupportedEncodingException {
            super(response);

            this.outputStream = new CustomServletOutPutStream();
            this.printWriter = new PrintWriter(new OutputStreamWriter(outputStream, ENCODE));

        }

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

        @Override
        public PrintWriter getWriter() throws IOException {
            return this.printWriter;
        }
    }

}

你可以称之为

    @Autowired
    InternalRenderer internalRenderer;

    @RequestMapping(value = "/internalRender")
    public void internalRender(HttpServletRequest request, HttpServletResponse response, Model model, Locale locale) throws Exception {

        String evalView = internalRenderer.evalView(request, response, model, locale, "index");

        logger.debug("evalView: " + evalView);

        //TODO: use the generated code to create the pdf and return it

    }

老回复：

您可以调用/ doSomething，获取生成的html并将其作为参数传递给另一个控制器，以使其创建pdf并将其作为最终结果返回（如果必须从html生成pdf，也许最好使用原始数据生成pdf）

call / doSomething（使用ajax？）
获取生成的html
call / createPdf将生成的html作为参数传递
获取生成的pdf

Answer 2

我找到了一种更简单的方式

1只添加依赖

testCompile group：＆＃39; org.springframework＆＃39;，name：＆＃39; spring-mock＆＃39;，version：＆＃39; 2.0.8＆＃39;

2然后使用

View resolvedView = this.viewResolver.resolveViewName("viewname", locale);
MockHttpServletResponse mockResp = new MockHttpServletResponse();
resolvedView.render(model, request, mockResp);
System.out.println("rendered html : " + mockResp.getContentAsString());

在Spring控制器中执行jsp并获取响应html

2 个答案: