|
1
14 package wingset;
15
16 import org.wings.*;
17 import org.wings.border.SEmptyBorder;
18
19 import java.awt.*;
20 import java.awt.event.ActionEvent  ;
21 import java.awt.event.ActionListener ;
22 import java.awt.event.ItemEvent ;
23 import java.awt.event.ItemListener ;
24 import java.io.BufferedReader ;
25 import java.io.File ;
26 import java.io.FileReader ;
27 import java.io.IOException ;
28
29
33 public class FileChooserExample
34 extends WingSetPane
35 {
36 final static Color WARN_COLOR = new Color(255, 255, 127);
37
38
41 SFileChooser chooser;
42
43
47 SCardLayout contentSwitcher;
48
49
52 SLabel iconLabel;
53
54
57 STextArea textArea;
58
59
62 SPanel textForm;
63
64
67 SLabel unknownLabel;
68
69
72 File previousFile;
73 private FileChooserControls controls;
74
75 public SComponent createExample() {
76 controls = new FileChooserControls();
77
78 SForm p = new SForm(new SBorderLayout());
79 p.setEncodingType("multipart/form-data");
80
81 p.add(controls, SBorderLayout.NORTH);
82 p.add(createUpload(), SBorderLayout.WEST);
83 p.add(createPreview(), SBorderLayout.CENTER);
84
85 controls.addSizable(chooser);
86 return p;
87 }
88
89 protected String getText(File f) {
90 try {
91 StringBuffer buffer = new StringBuffer ();
92 BufferedReader reader = new BufferedReader (new FileReader (f));
93
94 String line = reader.readLine();
95 while (line != null) {
96 buffer.append(line).append("\n");
97 line = reader.readLine();
98 }
99
100 return buffer.toString();
101 } catch (Exception ex) {
102 return "got exception " + ex.getMessage();
103 }
104 }
105
106 protected void adaptPreview() {
107 if (previousFile != null) {
108 previousFile.delete();
109 previousFile = null;
110 }
111 try {
112 if (chooser.getFileType().startsWith("text/")) {
113 textArea.setText(getText(chooser.getFile()));
114 contentSwitcher.show(textForm);
115 } else if (chooser.getFileType().startsWith("image/")) {
116 iconLabel.setIcon(new SFileIcon(chooser.getFile(), null,
117 chooser.getFileType()));
118 contentSwitcher.show(iconLabel);
119 } else {
120 contentSwitcher.show(unknownLabel);
121 }
122 previousFile = chooser.getFile();
123 } catch (Exception ex) {
124 contentSwitcher.show(unknownLabel);
125 }
126 }
127
128
129 protected SComponent createPreview() {
130 SPanel p = new SPanel(new SFlowDownLayout());
131 p.setVerticalAlignment(TOP);
132
133 SLabel previewLabel = new SLabel("Preview");
134 previewLabel.setBorder(new SEmptyBorder(0, 20, 0, 0));
135 p.add(previewLabel);
136
137 contentSwitcher = new SCardLayout();
138
139 SPanel contentPane = new SPanel(contentSwitcher);
140
141 iconLabel = new SLabel();
142
143 textForm = new SPanel();
144
145 textArea = new STextArea();
146 textArea.setColumns(50);
147 textArea.setRows(20);
148 textArea.setEditable(false);
149
150 unknownLabel = new SLabel("Unknown Content");
151 unknownLabel.setBackground(WARN_COLOR);
152
153 contentPane.add(iconLabel, "ICON");
154
155 textForm.add(textArea);
156 contentPane.add(textForm, "TEXT");
157
158 contentPane.add(unknownLabel, "UNKNOWN");
159
160 contentSwitcher.show(unknownLabel);
161
162 contentPane.setBorder(new SEmptyBorder(10, 20, 0, 0));
163 p.add(contentPane);
164 return p;
165 }
166
167 protected SComponent createUpload() {
168 SPanel form = new SPanel(new SFlowDownLayout());
169 form.setBorder(new SEmptyBorder(10, 5, 0, 0));
170
171 chooser = new SFileChooser();
172 form.add(chooser);
173
174 SButton submit = new SButton("upload");
175 submit.setVerticalAlignment(RIGHT);
176 form.add(submit);
177
178 SPanel p = new SPanel(new SGridLayout(2));
179 p.setBorder(new SEmptyBorder(10, 5, 0, 0));
180 p.add(new SLabel("message:"));
181 final SLabel message = new SLabel("");
182 p.add(message);
183
184 p.add(new SLabel("filename:"));
185 final SLabel filename = new SLabel("");
186 p.add(filename);
187
188 p.add(new SLabel("fileid:"));
189 final SLabel fileid = new SLabel("");
190 p.add(fileid);
191
192 p.add(new SLabel("filetype:"));
193 final SLabel filetype = new SLabel("");
194 p.add(filetype);
195
196 p.add(new SLabel("size:"));
197 final SLabel size = new SLabel("");
198 p.add(size);
199
200 form.add(p);
201
202
203 submit.addActionListener(new ActionListener () {
204 public void actionPerformed(ActionEvent e) {
205 try {
206 if (chooser.getFile() != null) {
207 message.setText("OK");
208 message.setBackground(null);
209 filename.setText(chooser.getFileName());
210 fileid.setText(chooser.getFileId());
211 filetype.setText(chooser.getFileType());
212 size.setText("" + chooser.getFile().length());
213 adaptPreview();
214 } else {
215 message.setText("No file chosen");
216 message.setBackground(WARN_COLOR);
217 }
218 } catch (IOException ex) {
219 message.setText(ex.getMessage());
220 message.setBackground(WARN_COLOR);
221 filename.setText("");
222 fileid.setText("");
223 filetype.setText("");
224 size.setText("");
225 contentSwitcher.show(unknownLabel);
226 }
227 chooser.reset();
228 }
229 });
230
231 form.setVerticalAlignment(TOP);
232
233 return form;
234 }
235
236 class FileChooserControls extends ComponentControls {
237 public FileChooserControls() {
238 Object [] values = {new Integer (1), new Integer (2), new Integer (4),
239 new Integer (8), new Integer (16), new Integer (32),
240 new Integer (64)};
241
242 final SComboBox comboBox = new SComboBox(values);
243 comboBox.addItemListener(new ItemListener () {
244 public void itemStateChanged(ItemEvent e) {
245 getSession().setMaxContentLength(((Integer ) comboBox.getSelectedItem()).intValue());
246 }
247 });
248 comboBox.setSelectedItem(new Integer (getSession().getMaxContentLength()));
249
250 add(new SLabel("Maximum Content Length [kB]: "));
251 add(comboBox);
252 }
253 }
254 }
255 |
Popular Tags |
Java API By Example, From Geeks To Geeks.