图片的路径===http://127.0.0.1:8090/image?name=takeout/imgs/seller/3.jpg
HomeRvAdapter.kt加载图片的方法，其中服务端的url是“takeout/imgs/seller/3.jpg”通过拼接“http://127.0.0.1:8090/image?name=”的方法来请求图片
package com.example.takeout.ui.adapter import android.content.Context import android.view.View import android.view.ViewGroup import android.widget.ImageView import android.widget.RatingBar import android.widget.TextView import androidx.recyclerview.widget.RecyclerView import com.daimajia.slider.library.SliderLayout import com.daimajia.slider.library.SliderTypes.TextSliderView import com.example.takeout.R import com.heima.takeout.model.beans.Seller import com.squareup.picasso.Picasso import org.jetbrains.anko.find class HomeRvAdapter(val context: Context) : RecyclerView.Adapter<RecyclerView.ViewHolder>() { //定义常量 companion object { val TYPE_TITLE = 0 val TYPE_SELLER = 1 } val host = "http://127.0.0.1:8090/image?name=" var mDatas: ArrayList<Seller> = ArrayList() fun setData(data: ArrayList<Seller>) { this.mDatas = data notifyDataSetChanged() } /** * 不同position对应不同类型 */ override fun getItemViewType(position: Int): Int { if (position == 0) { return TYPE_TITLE } else { return TYPE_SELLER } } override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) { val viewType = getItemViewType(position) when (viewType) { TYPE_TITLE -> (holder as TitleHolder).bindData("我是title----------------------------------------") TYPE_SELLER -> (holder as SellerHolder).bindData(mDatas[position - 1]) } } override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder { when (viewType) { TYPE_TITLE -> return TitleHolder(View.inflate(context, R.layout.item_title, null)) TYPE_SELLER -> return SellerHolder(View.inflate(context, R.layout.item_seller, null)) else -> return TitleHolder(View.inflate(context, R.layout.item_home_common, null)) } } override fun getItemCount(): Int { if (mDatas.size > 0) { return mDatas.size + 1 } else { return 0 } } //内部类，商家的holder inner class SellerHolder(item: View) : RecyclerView.ViewHolder(item) { val tvTitle: TextView val ivLogo: ImageView val rbScore: RatingBar val tvSale: TextView val tvSendPrice: TextView init { tvTitle = item.find(R.id.tv_title) ivLogo = item.find(R.id.seller_logo) rbScore = item.find(R.id.ratingBar) tvSale = item.find(R.id.tv_home_sale) tvSendPrice = item.find(R.id.tv_home_send_price) } fun bindData(seller: Seller) { tvTitle.text = seller.name //图片路径http://127.0.0.1:8090/image?name=takeout/imgs/seller/3.jpg println("seller.ensure====" + seller.ensure) Picasso.with(context).load(host + seller.ensure).into(ivLogo) rbScore.rating = seller.score.toFloat() tvSale.text = "月售${seller.sale}单" tvSendPrice.text = "￥${seller.sendPrice}起送/配送费￥${seller.deliveryFee}" } } //存放图片的url和名称 var url_maps: HashMap<String, Int> = HashMap() //内部类，title的holder inner class TitleHolder(item: View) : RecyclerView.ViewHolder(item) { val sliderLayout: SliderLayout init { sliderLayout = item.findViewById(R.id.slider) } fun bindData(data: String) { if (url_maps.size == 0) { url_maps.put("Hannibal", R.mipmap.pic1); url_maps.put("Big Bang Theory", R.mipmap.pic2); url_maps.put("House of Cards", R.mipmap.pic3); url_maps.put("Game of Thrones", R.mipmap.pic4); for ((key, value) in url_maps) { val textSlideView: TextSliderView = TextSliderView(context) textSlideView.description(key).image(value) sliderLayout.addSlider(textSlideView) } } } } }ServlertConfig.java中新增配置请求图片的servelet
handler.addServlet(new ServletHolder(new TakeoutImgServlet()), "/takeoutImg");TakeoutImgServlet.java请求的图片的方法：http://127.0.0.1:8090/image?name=takeout/imgs/seller/3.jpg其中takeout/imgs/seller/3.jpg是url
package cn.ldw.servlet; import android.os.Environment; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.OutputStream; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class TakeoutImgServlet extends BaseServlet { private static final long serialVersionUID = 1L; @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { resp.setStatus(HttpServletResponse.SC_OK); String name = req.getParameter("name"); String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + "Apaches/" + name; File file = new File(path); long length = file.length(); resp.setContentLength((int) length); OutputStream out = resp.getOutputStream(); FileInputStream stream = new FileInputStream(file); int count = -1; byte[] buffer = new byte[1024]; while ((count = stream.read(buffer)) != -1) { out.write(buffer, 0, count); out.flush(); } stream.close(); out.close(); } }效果图如下：
