渲染者JspRenderer.java完成视图的选择和把数据放入作用域。

package cn.eternal.renderer;import java.util.HashMap;import java.util.Map;import java.util.Set;import javax.servlet.ServletContext;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class JspRenderer extends Renderer {    private String path;    private Map
    
      model;    protected String contentType;    public String getContentType() {        return contentType;    }    public void setContentType(String contentType) {        this.contentType = contentType;    }    public JspRenderer(String path) {        this.path = path;        this.model = new HashMap
     
      ();    }    public JspRenderer(String path, Map
      
        model) {        this.path = path;        this.model = model;    }    public JspRenderer(String path, String modelKey, Object modelValue) {        this.path = path;        this.model = new HashMap
       
        ();        this.model.put(modelKey, modelValue);    }    @Override    public void render(ServletContext context, HttpServletRequest request, HttpServletResponse response) throws Exception {        Set
        
          keys = model.keySet();        for (String key : keys) {            request.setAttribute(key, model.get(key));        }        request.getRequestDispatcher(path).forward(request, response);    }}